Merge "res_calendar: Specialized calendars depend on symbols of general calendar."
[asterisk/asterisk.git] / main / channel_internal_api.c
index bec785f..d31ce94 100644 (file)
  * \author Terry Wilson
  */
 
+/*** MODULEINFO
+       <support_level>core</support_level>
+ ***/
+
 #include "asterisk.h"
 
-ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+#include <unistd.h>
+#include <fcntl.h>
 
+#include "asterisk/alertpipe.h"
+#include "asterisk/paths.h"
 #include "asterisk/channel.h"
-#include "asterisk/stringfields.h"
-#include "asterisk/data.h"
+#include "asterisk/channel_internal.h"
+#include "asterisk/endpoints.h"
 #include "asterisk/indications.h"
+#include "asterisk/stasis_cache_pattern.h"
+#include "asterisk/stasis_channels.h"
+#include "asterisk/stasis_endpoints.h"
+#include "asterisk/stringfields.h"
+#include "asterisk/stream.h"
+#include "asterisk/test.h"
+#include "asterisk/vector.h"
 
-/* AST_DATA definitions, which will probably have to be re-thought since the channel will be opaque */
-
-#if 0  /* XXX AstData: ast_callerid no longer exists. (Equivalent code not readily apparent.) */
-#define DATA_EXPORT_CALLERID(MEMBER)                           \
-       MEMBER(ast_callerid, cid_dnid, AST_DATA_STRING)         \
-       MEMBER(ast_callerid, cid_num, AST_DATA_STRING)          \
-       MEMBER(ast_callerid, cid_name, AST_DATA_STRING)         \
-       MEMBER(ast_callerid, cid_ani, AST_DATA_STRING)          \
-       MEMBER(ast_callerid, cid_pres, AST_DATA_INTEGER)        \
-       MEMBER(ast_callerid, cid_ani2, AST_DATA_INTEGER)        \
-       MEMBER(ast_callerid, cid_tag, AST_DATA_STRING)
-
-AST_DATA_STRUCTURE(ast_callerid, DATA_EXPORT_CALLERID);
-#endif
-
-#define DATA_EXPORT_CHANNEL(MEMBER)                                            \
-       MEMBER(ast_channel, __do_not_use_blockproc, AST_DATA_STRING)                            \
-       MEMBER(ast_channel, __do_not_use_appl, AST_DATA_STRING)                         \
-       MEMBER(ast_channel, __do_not_use_data, AST_DATA_STRING)                         \
-       MEMBER(ast_channel, __do_not_use_name, AST_DATA_STRING) \
-       MEMBER(ast_channel, __do_not_use_language, AST_DATA_STRING)                             \
-       MEMBER(ast_channel, __do_not_use_musicclass, AST_DATA_STRING)                   \
-       MEMBER(ast_channel, __do_not_use_accountcode, AST_DATA_STRING)                  \
-       MEMBER(ast_channel, __do_not_use_peeraccount, AST_DATA_STRING)                  \
-       MEMBER(ast_channel, __do_not_use_userfield, AST_DATA_STRING)                            \
-       MEMBER(ast_channel, __do_not_use_call_forward, AST_DATA_STRING)                 \
-       MEMBER(ast_channel, __do_not_use_uniqueid, AST_DATA_STRING)                             \
-       MEMBER(ast_channel, __do_not_use_linkedid, AST_DATA_STRING)                             \
-       MEMBER(ast_channel, __do_not_use_parkinglot, AST_DATA_STRING)                   \
-       MEMBER(ast_channel, __do_not_use_hangupsource, AST_DATA_STRING)                 \
-       MEMBER(ast_channel, __do_not_use_dialcontext, AST_DATA_STRING)                  \
-       MEMBER(ast_channel, __do_not_use_rings, AST_DATA_INTEGER)                               \
-       MEMBER(ast_channel, __do_not_use_priority, AST_DATA_INTEGER)                            \
-       MEMBER(ast_channel, __do_not_use_macropriority, AST_DATA_INTEGER)                       \
-       MEMBER(ast_channel, __do_not_use_adsicpe, AST_DATA_INTEGER)                             \
-       MEMBER(ast_channel, __do_not_use_fin, AST_DATA_UNSIGNED_INTEGER)                        \
-       MEMBER(ast_channel, __do_not_use_fout, AST_DATA_UNSIGNED_INTEGER)                       \
-       MEMBER(ast_channel, __do_not_use_emulate_dtmf_duration, AST_DATA_UNSIGNED_INTEGER)      \
-       MEMBER(ast_channel, __do_not_use_visible_indication, AST_DATA_INTEGER)          \
-       MEMBER(ast_channel, __do_not_use_context, AST_DATA_STRING)                              \
-       MEMBER(ast_channel, __do_not_use_exten, AST_DATA_STRING)                                \
-       MEMBER(ast_channel, __do_not_use_macrocontext, AST_DATA_STRING)                 \
-       MEMBER(ast_channel, __do_not_use_macroexten, AST_DATA_STRING)
-
-AST_DATA_STRUCTURE(ast_channel, DATA_EXPORT_CHANNEL);
-
-static void channel_data_add_flags(struct ast_data *tree,
-       struct ast_channel *chan)
-{
-       ast_data_add_bool(tree, "DEFER_DTMF", ast_test_flag(chan, AST_FLAG_DEFER_DTMF));
-       ast_data_add_bool(tree, "WRITE_INT", ast_test_flag(chan, AST_FLAG_WRITE_INT));
-       ast_data_add_bool(tree, "BLOCKING", ast_test_flag(chan, AST_FLAG_BLOCKING));
-       ast_data_add_bool(tree, "ZOMBIE", ast_test_flag(chan, AST_FLAG_ZOMBIE));
-       ast_data_add_bool(tree, "EXCEPTION", ast_test_flag(chan, AST_FLAG_EXCEPTION));
-       ast_data_add_bool(tree, "MOH", ast_test_flag(chan, AST_FLAG_MOH));
-       ast_data_add_bool(tree, "SPYING", ast_test_flag(chan, AST_FLAG_SPYING));
-       ast_data_add_bool(tree, "NBRIDGE", ast_test_flag(chan, AST_FLAG_NBRIDGE));
-       ast_data_add_bool(tree, "IN_AUTOLOOP", ast_test_flag(chan, AST_FLAG_IN_AUTOLOOP));
-       ast_data_add_bool(tree, "OUTGOING", ast_test_flag(chan, AST_FLAG_OUTGOING));
-       ast_data_add_bool(tree, "IN_DTMF", ast_test_flag(chan, AST_FLAG_IN_DTMF));
-       ast_data_add_bool(tree, "EMULATE_DTMF", ast_test_flag(chan, AST_FLAG_EMULATE_DTMF));
-       ast_data_add_bool(tree, "END_DTMF_ONLY", ast_test_flag(chan, AST_FLAG_END_DTMF_ONLY));
-       ast_data_add_bool(tree, "ANSWERED_ELSEWHERE", ast_test_flag(chan, AST_FLAG_ANSWERED_ELSEWHERE));
-       ast_data_add_bool(tree, "MASQ_NOSTREAM", ast_test_flag(chan, AST_FLAG_MASQ_NOSTREAM));
-       ast_data_add_bool(tree, "BRIDGE_HANGUP_RUN", ast_test_flag(chan, AST_FLAG_BRIDGE_HANGUP_RUN));
-       ast_data_add_bool(tree, "BRIDGE_HANGUP_DONT", ast_test_flag(chan, AST_FLAG_BRIDGE_HANGUP_DONT));
-       ast_data_add_bool(tree, "DISABLE_WORKAROUNDS", ast_test_flag(chan, AST_FLAG_DISABLE_WORKAROUNDS));
-}
-
-int ast_channel_data_add_structure(struct ast_data *tree,
-       struct ast_channel *chan, int add_bridged)
-{
-       struct ast_channel *bc;
-       struct ast_data *data_bridged;
-       struct ast_data *data_cdr;
-       struct ast_data *data_flags;
-       struct ast_data *data_zones;
-       struct ast_data *enum_node;
-       struct ast_data *data_softhangup;
-#if 0  /* XXX AstData: ast_callerid no longer exists. (Equivalent code not readily apparent.) */
-       struct ast_data *data_callerid;
-       char value_str[100];
-#endif
-
-       if (!tree) {
-               return -1;
-       }
+/*!
+ * \brief Channel UniqueId structure
+ * \note channel creation time used for determining LinkedId Propagation
+ */
+struct ast_channel_id {
+       time_t creation_time;                           /*!< Creation time */
+       int creation_unique;                            /*!< sub-second unique value */
+       char unique_id[AST_MAX_UNIQUEID];       /*!< Unique Identifier */
+};
 
-       ast_data_add_structure(ast_channel, tree, chan);
+/*!
+ * \brief Main Channel structure associated with a channel.
+ *
+ * \note When adding fields to this structure, it is important to add the field
+ *       'in position' with like-aligned fields, so as to keep the compiler from
+ *       having to add padding to align fields. The structure's fields are sorted
+ *       in this order: pointers, structures, long, int/enum, short, char. This
+ *       is especially important on 64-bit architectures, where mixing 4-byte
+ *       and 8-byte fields causes 4 bytes of padding to be added before many
+ *       8-byte fields.
+ */
+struct ast_channel {
+       const struct ast_channel_tech *tech;            /*!< Technology (point to channel driver) */
+       void *tech_pvt;                                 /*!< Private data used by the technology driver */
+       void *music_state;                              /*!< Music State*/
+       void *generatordata;                            /*!< Current generator data if there is any */
+       struct ast_generator *generator;                /*!< Current active data generator */
+       struct ast_channel *masq;                       /*!< Channel that will masquerade as us */
+       struct ast_channel *masqr;                      /*!< Who we are masquerading as */
+       const char *blockproc;                          /*!< Procedure causing blocking */
+       const char *appl;                               /*!< Current application */
+       const char *data;                               /*!< Data passed to current application */
+       struct ast_sched_context *sched;                /*!< Schedule context */
+       struct ast_filestream *stream;                  /*!< Stream itself. */
+       struct ast_filestream *vstream;                 /*!< Video Stream itself. */
+       ast_timing_func_t timingfunc;
+       void *timingdata;
+       struct ast_pbx *pbx;                            /*!< PBX private structure for this channel */
+       struct ast_trans_pvt *writetrans;               /*!< Write translation path */
+       struct ast_trans_pvt *readtrans;                /*!< Read translation path */
+       struct ast_audiohook_list *audiohooks;
+       struct ast_framehook_list *framehooks;
+       struct ast_cdr *cdr;                            /*!< Call Detail Record */
+       struct ast_tone_zone *zone;                     /*!< Tone zone as set in indications.conf or
+                                                        *   in the CHANNEL dialplan function */
+       struct ast_channel_monitor *monitor;            /*!< Channel monitoring */
+       ast_callid callid;                      /*!< Bound call identifier pointer */
+       struct ao2_container *dialed_causes;            /*!< Contains tech-specific and Asterisk cause data from dialed channels */
 
-       if (add_bridged) {
-               bc = ast_bridged_channel(chan);
-               if (bc) {
-                       data_bridged = ast_data_add_node(tree, "bridged");
-                       if (!data_bridged) {
-                               return -1;
-                       }
-                       ast_channel_data_add_structure(data_bridged, bc, 0);
-               }
-       }
+       AST_DECLARE_STRING_FIELDS(
+               AST_STRING_FIELD(name);         /*!< ASCII unique channel name */
+               AST_STRING_FIELD(language);     /*!< Language requested for voice prompts */
+               AST_STRING_FIELD(musicclass);   /*!< Default music class */
+               AST_STRING_FIELD(latest_musicclass);   /*!< Latest active music class */
+               AST_STRING_FIELD(accountcode);  /*!< Account code for billing */
+               AST_STRING_FIELD(peeraccount);  /*!< Peer account code for billing */
+               AST_STRING_FIELD(userfield);    /*!< Userfield for CEL billing */
+               AST_STRING_FIELD(call_forward); /*!< Where to forward to if asked to dial on this interface */
+               AST_STRING_FIELD(parkinglot);   /*! Default parking lot, if empty, default parking lot  */
+               AST_STRING_FIELD(hangupsource); /*! Who is responsible for hanging up this channel */
+               AST_STRING_FIELD(dialcontext);  /*!< Dial: Extension context that we were called from */
+       );
 
-       ast_data_add_codec(tree, "oldwriteformat", ast_channel_oldwriteformat(chan));
-       ast_data_add_codec(tree, "readformat", ast_channel_readformat(chan));
-       ast_data_add_codec(tree, "writeformat", ast_channel_writeformat(chan));
-       ast_data_add_codec(tree, "rawreadformat", ast_channel_rawreadformat(chan));
-       ast_data_add_codec(tree, "rawwriteformat", ast_channel_rawwriteformat(chan));
-       ast_data_add_codecs(tree, "nativeformats", ast_channel_nativeformats(chan));
+       struct ast_channel_id uniqueid;         /*!< Unique Channel Identifier - can be specified on creation */
+       struct ast_channel_id linkedid;         /*!< Linked Channel Identifier - oldest propagated when bridged */
 
-       /* state */
-       enum_node = ast_data_add_node(tree, "state");
-       if (!enum_node) {
-               return -1;
-       }
-       ast_data_add_str(enum_node, "text", ast_state2str(ast_channel_state(chan)));
-       ast_data_add_int(enum_node, "value", ast_channel_state(chan));
+       struct timeval whentohangup; /*!< Non-zero, set to actual time when channel is to be hung up */
+       pthread_t blocker;           /*!< If anyone is blocking, this is them */
 
-       /* hangupcause */
-       enum_node = ast_data_add_node(tree, "hangupcause");
-       if (!enum_node) {
-               return -1;
-       }
-       ast_data_add_str(enum_node, "text", ast_cause2str(ast_channel_hangupcause(chan)));
-       ast_data_add_int(enum_node, "value", ast_channel_hangupcause(chan));
+       /*!
+        * \brief Dialed/Called information.
+        * \note Set on incoming channels to indicate the originally dialed party.
+        * \note Dialed Number Identifier (DNID)
+        */
+       struct ast_party_dialed dialed;
 
-       /* amaflags */
-       enum_node = ast_data_add_node(tree, "amaflags");
-       if (!enum_node) {
-               return -1;
-       }
-       ast_data_add_str(enum_node, "text", ast_cdr_flags2str(ast_channel_amaflags(chan)));
-       ast_data_add_int(enum_node, "value", ast_channel_amaflags(chan));
+       /*!
+        * \brief Channel Caller ID information.
+        * \note The caller id information is the caller id of this
+        * channel when it is used to initiate a call.
+        */
+       struct ast_party_caller caller;
 
-       /* transfercapability */
-       enum_node = ast_data_add_node(tree, "transfercapability");
-       if (!enum_node) {
-               return -1;
-       }
-       ast_data_add_str(enum_node, "text", ast_transfercapability2str(ast_channel_transfercapability(chan)));
-       ast_data_add_int(enum_node, "value", ast_channel_transfercapability(chan));
+       /*!
+        * \brief Channel Connected Line ID information.
+        * \note The connected line information identifies the channel
+        * connected/bridged to this channel.
+        */
+       struct ast_party_connected_line connected;
 
-       /* _softphangup */
-       data_softhangup = ast_data_add_node(tree, "softhangup");
-       if (!data_softhangup) {
-               return -1;
-       }
-       ast_data_add_bool(data_softhangup, "dev", chan->_softhangup & AST_SOFTHANGUP_DEV);
-       ast_data_add_bool(data_softhangup, "asyncgoto", chan->_softhangup & AST_SOFTHANGUP_ASYNCGOTO);
-       ast_data_add_bool(data_softhangup, "shutdown", chan->_softhangup & AST_SOFTHANGUP_SHUTDOWN);
-       ast_data_add_bool(data_softhangup, "timeout", chan->_softhangup & AST_SOFTHANGUP_TIMEOUT);
-       ast_data_add_bool(data_softhangup, "appunload", chan->_softhangup & AST_SOFTHANGUP_APPUNLOAD);
-       ast_data_add_bool(data_softhangup, "explicit", chan->_softhangup & AST_SOFTHANGUP_EXPLICIT);
-       ast_data_add_bool(data_softhangup, "unbridge", chan->_softhangup & AST_SOFTHANGUP_UNBRIDGE);
-
-       /* channel flags */
-       data_flags = ast_data_add_node(tree, "flags");
-       if (!data_flags) {
-               return -1;
-       }
-       channel_data_add_flags(data_flags, chan);
+       /*!
+        * \brief Channel Connected Line ID information that was last indicated.
+        */
+       struct ast_party_connected_line connected_indicated;
 
-       ast_data_add_uint(tree, "timetohangup", ast_channel_whentohangup(chan)->tv_sec);
+       /*! \brief Redirecting/Diversion information */
+       struct ast_party_redirecting redirecting;
 
-#if 0  /* XXX AstData: ast_callerid no longer exists. (Equivalent code not readily apparent.) */
-       /* callerid */
-       data_callerid = ast_data_add_node(tree, "callerid");
-       if (!data_callerid) {
-               return -1;
-       }
-       ast_data_add_structure(ast_callerid, data_callerid, &(chan->cid));
-       /* insert the callerid ton */
-       enum_node = ast_data_add_node(data_callerid, "cid_ton");
-       if (!enum_node) {
-               return -1;
-       }
-       ast_data_add_int(enum_node, "value", chan->cid.cid_ton);
-       snprintf(value_str, sizeof(value_str), "TON: %s/Plan: %s",
-               party_number_ton2str(chan->cid.cid_ton),
-               party_number_plan2str(chan->cid.cid_ton));
-       ast_data_add_str(enum_node, "text", value_str);
-#endif
-
-       /* tone zone */
-       if (ast_channel_zone(chan)) {
-               data_zones = ast_data_add_node(tree, "zone");
-               if (!data_zones) {
-                       return -1;
-               }
-               ast_tone_zone_data_add_structure(data_zones, ast_channel_zone(chan));
-       }
+       struct ast_frame dtmff;                         /*!< DTMF frame */
+       struct varshead varshead;                       /*!< A linked list for channel variables. See \ref AstChanVar */
+       ast_group_t callgroup;                          /*!< Call group for call pickups */
+       ast_group_t pickupgroup;                        /*!< Pickup group - which calls groups can be picked up? */
+       struct ast_namedgroups *named_callgroups;       /*!< Named call group for call pickups */
+       struct ast_namedgroups *named_pickupgroups;     /*!< Named pickup group - which call groups can be picked up? */
+       struct timeval creationtime;                    /*!< The time of channel creation */
+       struct timeval answertime;                              /*!< The time the channel was answered */
+       struct ast_readq_list readq;
+       struct ast_jb jb;                               /*!< The jitterbuffer state */
+       struct timeval dtmf_tv;                         /*!< The time that an in process digit began, or the last digit ended */
+       struct ast_hangup_handler_list hangup_handlers;/*!< Hangup handlers on the channel. */
+       struct ast_datastore_list datastores; /*!< Data stores on the channel */
+       struct ast_autochan_list autochans; /*!< Autochans on the channel */
+       unsigned long insmpl;                           /*!< Track the read/written samples for monitor use */
+       unsigned long outsmpl;                          /*!< Track the read/written samples for monitor use */
 
-       /* insert cdr */
-       data_cdr = ast_data_add_node(tree, "cdr");
-       if (!data_cdr) {
-               return -1;
-       }
+       AST_VECTOR(, int) fds;                          /*!< File descriptors for channel -- Drivers will poll on
+                                                        *   these file descriptors, so at least one must be non -1.
+                                                        *   See \arg \ref AstFileDesc */
+       int softhangup;                         /*!< Whether or not we have been hung up...  Do not set this value
+                                                        *   directly, use ast_softhangup() */
+       int fdno;                                       /*!< Which fd had an event detected on */
+       int streamid;                                   /*!< For streaming playback, the schedule ID */
+       int vstreamid;                                  /*!< For streaming video playback, the schedule ID */
+       struct ast_format *oldwriteformat;  /*!< Original writer format */
+       int timingfd;                                   /*!< Timing fd */
+       enum ast_channel_state state;                   /*!< State of line -- Don't write directly, use ast_setstate() */
+       int rings;                                      /*!< Number of rings so far */
+       int priority;                                   /*!< Dialplan: Current extension priority */
+       int macropriority;                              /*!< Macro: Current non-macro priority. See app_macro.c */
+       int amaflags;                                   /*!< Set BEFORE PBX is started to determine AMA flags */
+       enum ast_channel_adsicpe adsicpe;               /*!< Whether or not ADSI is detected on CPE */
+       unsigned int fin;                               /*!< Frames in counters. The high bit is a debug mask, so
+                                                        *   the counter is only in the remaining bits */
+       unsigned int fout;                              /*!< Frames out counters. The high bit is a debug mask, so
+                                                        *   the counter is only in the remaining bits */
+       int hangupcause;                                /*!< Why is the channel hanged up. See causes.h */
+       unsigned int finalized:1;       /*!< Whether or not the channel has been successfully allocated */
+       struct ast_flags flags;                         /*!< channel flags of AST_FLAG_ type */
+       int alertpipe[2];
+       struct ast_format_cap *nativeformats;         /*!< Kinds of data this channel can natively handle */
+       struct ast_format *readformat;            /*!< Requested read format (after translation) */
+       struct ast_format *writeformat;           /*!< Requested write format (before translation) */
+       struct ast_format *rawreadformat;         /*!< Raw read format (before translation) */
+       struct ast_format *rawwriteformat;        /*!< Raw write format (after translation) */
+       unsigned int emulate_dtmf_duration;             /*!< Number of ms left to emulate DTMF for */
+       int visible_indication;                         /*!< Indication currently playing on the channel */
+       int hold_state;                                                 /*!< Current Hold/Unhold state */
 
-       ast_cdr_data_add_structure(data_cdr, ast_channel_cdr(chan), 1);
+       unsigned short transfercapability;              /*!< ISDN Transfer Capability - AST_FLAG_DIGITAL is not enough */
 
-       return 0;
-}
+       struct ast_bridge *bridge;                      /*!< Bridge this channel is participating in */
+       struct ast_bridge_channel *bridge_channel;/*!< The bridge_channel this channel is linked with. */
+       struct ast_timer *timer;                        /*!< timer object that provided timingfd */
 
-int ast_channel_data_cmp_structure(const struct ast_data_search *tree,
-       struct ast_channel *chan, const char *structure_name)
-{
-       return ast_data_search_cmp_structure(tree, ast_channel, chan, structure_name);
-}
+       char context[AST_MAX_CONTEXT];                  /*!< Dialplan: Current extension context */
+       char exten[AST_MAX_EXTENSION];                  /*!< Dialplan: Current extension number */
+       char macrocontext[AST_MAX_CONTEXT];             /*!< Macro: Current non-macro context. See app_macro.c */
+       char macroexten[AST_MAX_EXTENSION];             /*!< Macro: Current non-macro extension. See app_macro.c */
+       char unbridged;                                                 /*!< non-zero if the bridge core needs to re-evaluate the current
+                                                                                        bridging technology which is in use by this channel's bridge. */
+       char is_t38_active;                                             /*!< non-zero if T.38 is active on this channel. */
+       char dtmf_digit_to_emulate;                     /*!< Digit being emulated */
+       char sending_dtmf_digit;                        /*!< Digit this channel is currently sending out. (zero if not sending) */
+       struct timeval sending_dtmf_tv;         /*!< The time this channel started sending the current digit. (Invalid if sending_dtmf_digit is zero.) */
+       struct stasis_cp_single *topics;                /*!< Topic for all channel's events */
+       struct stasis_forward *endpoint_forward;        /*!< Subscription for event forwarding to endpoint's topic */
+       struct stasis_forward *endpoint_cache_forward; /*!< Subscription for cache updates to endpoint's topic */
+       struct ast_stream_topology *stream_topology; /*!< Stream topology */
+       void *stream_topology_change_source; /*!< Source that initiated a stream topology change */
+       struct ast_stream *default_streams[AST_MEDIA_TYPE_END]; /*!< Default streams indexed by media type */
+};
+
+/*! \brief The monotonically increasing integer counter for channel uniqueids */
+static int uniqueint;
 
 /* ACCESSORS */
 
-#define DEFINE_STRINGFIELD_SETTERS_FOR(field) \
+#define DEFINE_STRINGFIELD_SETTERS_FOR(field, publish, assert_on_null) \
 void ast_channel_##field##_set(struct ast_channel *chan, const char *value) \
 { \
-       ast_string_field_set(chan, __do_not_use_##field, value); \
+       if ((assert_on_null)) ast_assert(!ast_strlen_zero(value)); \
+       if (!strcmp(value, chan->field)) return; \
+       ast_string_field_set(chan, field, value); \
+       if (publish && ast_channel_internal_is_finalized(chan)) ast_channel_publish_snapshot(chan); \
 } \
   \
 void ast_channel_##field##_build_va(struct ast_channel *chan, const char *fmt, va_list ap) \
 { \
-       ast_string_field_build_va(chan, __do_not_use_##field, fmt, ap); \
+       ast_string_field_build_va(chan, field, fmt, ap); \
+       if (publish && ast_channel_internal_is_finalized(chan)) ast_channel_publish_snapshot(chan); \
 } \
 void ast_channel_##field##_build(struct ast_channel *chan, const char *fmt, ...) \
 { \
@@ -263,516 +249,1310 @@ void ast_channel_##field##_build(struct ast_channel *chan, const char *fmt, ...)
        va_end(ap); \
 }
 
-DEFINE_STRINGFIELD_SETTERS_FOR(name)
-DEFINE_STRINGFIELD_SETTERS_FOR(language)
-DEFINE_STRINGFIELD_SETTERS_FOR(musicclass)
-DEFINE_STRINGFIELD_SETTERS_FOR(accountcode)
-DEFINE_STRINGFIELD_SETTERS_FOR(peeraccount)
-DEFINE_STRINGFIELD_SETTERS_FOR(userfield)
-DEFINE_STRINGFIELD_SETTERS_FOR(call_forward)
-DEFINE_STRINGFIELD_SETTERS_FOR(uniqueid)
-DEFINE_STRINGFIELD_SETTERS_FOR(linkedid)
-DEFINE_STRINGFIELD_SETTERS_FOR(parkinglot)
-DEFINE_STRINGFIELD_SETTERS_FOR(hangupsource)
-DEFINE_STRINGFIELD_SETTERS_FOR(dialcontext)
+DEFINE_STRINGFIELD_SETTERS_FOR(name, 0, 1);
+DEFINE_STRINGFIELD_SETTERS_FOR(language, 1, 0);
+DEFINE_STRINGFIELD_SETTERS_FOR(musicclass, 0, 0);
+DEFINE_STRINGFIELD_SETTERS_FOR(latest_musicclass, 0, 0);
+DEFINE_STRINGFIELD_SETTERS_FOR(accountcode, 1, 0);
+DEFINE_STRINGFIELD_SETTERS_FOR(peeraccount, 1, 0);
+DEFINE_STRINGFIELD_SETTERS_FOR(userfield, 0, 0);
+DEFINE_STRINGFIELD_SETTERS_FOR(call_forward, 0, 0);
+DEFINE_STRINGFIELD_SETTERS_FOR(parkinglot, 0, 0);
+DEFINE_STRINGFIELD_SETTERS_FOR(hangupsource, 0, 0);
+DEFINE_STRINGFIELD_SETTERS_FOR(dialcontext, 0, 0);
 
 #define DEFINE_STRINGFIELD_GETTER_FOR(field) const char *ast_channel_##field(const struct ast_channel *chan) \
 { \
-       return chan->__do_not_use_##field; \
-}
-
-DEFINE_STRINGFIELD_GETTER_FOR(name)
-DEFINE_STRINGFIELD_GETTER_FOR(language)
-DEFINE_STRINGFIELD_GETTER_FOR(musicclass)
-DEFINE_STRINGFIELD_GETTER_FOR(accountcode)
-DEFINE_STRINGFIELD_GETTER_FOR(peeraccount)
-DEFINE_STRINGFIELD_GETTER_FOR(userfield)
-DEFINE_STRINGFIELD_GETTER_FOR(call_forward)
-DEFINE_STRINGFIELD_GETTER_FOR(uniqueid)
-DEFINE_STRINGFIELD_GETTER_FOR(linkedid)
-DEFINE_STRINGFIELD_GETTER_FOR(parkinglot)
-DEFINE_STRINGFIELD_GETTER_FOR(hangupsource)
-DEFINE_STRINGFIELD_GETTER_FOR(dialcontext)
+       return chan->field; \
+}
+
+DEFINE_STRINGFIELD_GETTER_FOR(name);
+DEFINE_STRINGFIELD_GETTER_FOR(language);
+DEFINE_STRINGFIELD_GETTER_FOR(musicclass);
+DEFINE_STRINGFIELD_GETTER_FOR(latest_musicclass);
+DEFINE_STRINGFIELD_GETTER_FOR(accountcode);
+DEFINE_STRINGFIELD_GETTER_FOR(peeraccount);
+DEFINE_STRINGFIELD_GETTER_FOR(userfield);
+DEFINE_STRINGFIELD_GETTER_FOR(call_forward);
+DEFINE_STRINGFIELD_GETTER_FOR(parkinglot);
+DEFINE_STRINGFIELD_GETTER_FOR(hangupsource);
+DEFINE_STRINGFIELD_GETTER_FOR(dialcontext);
+
+const char *ast_channel_uniqueid(const struct ast_channel *chan)
+{
+       ast_assert(chan->uniqueid.unique_id[0] != '\0');
+       return chan->uniqueid.unique_id;
+}
+
+const char *ast_channel_linkedid(const struct ast_channel *chan)
+{
+       ast_assert(chan->linkedid.unique_id[0] != '\0');
+       return chan->linkedid.unique_id;
+}
 
 const char *ast_channel_appl(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_appl;
+       return chan->appl;
 }
 void ast_channel_appl_set(struct ast_channel *chan, const char *value)
 {
-       chan->__do_not_use_appl = value;
+       chan->appl = value;
 }
 const char *ast_channel_blockproc(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_blockproc;
+       return chan->blockproc;
 }
 void ast_channel_blockproc_set(struct ast_channel *chan, const char *value)
 {
-       chan->__do_not_use_blockproc = value;
+       chan->blockproc = value;
 }
 const char *ast_channel_data(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_data;
+       return chan->data;
 }
 void ast_channel_data_set(struct ast_channel *chan, const char *value)
 {
-       chan->__do_not_use_data = value;
+       chan->data = value;
 }
 
-
 const char *ast_channel_context(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_context;
+       return chan->context;
 }
 void ast_channel_context_set(struct ast_channel *chan, const char *value)
 {
-       ast_copy_string(chan->__do_not_use_context, value, sizeof(chan->__do_not_use_context));
+       ast_copy_string(chan->context, value, sizeof(chan->context));
 }
 const char *ast_channel_exten(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_exten;
+       return chan->exten;
 }
 void ast_channel_exten_set(struct ast_channel *chan, const char *value)
 {
-       ast_copy_string(chan->__do_not_use_exten, value, sizeof(chan->__do_not_use_exten));
+       ast_copy_string(chan->exten, value, sizeof(chan->exten));
 }
 const char *ast_channel_macrocontext(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_macrocontext;
+       return chan->macrocontext;
 }
 void ast_channel_macrocontext_set(struct ast_channel *chan, const char *value)
 {
-       ast_copy_string(chan->__do_not_use_macrocontext, value, sizeof(chan->__do_not_use_macrocontext));
+       ast_copy_string(chan->macrocontext, value, sizeof(chan->macrocontext));
 }
 const char *ast_channel_macroexten(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_macroexten;
+       return chan->macroexten;
 }
 void ast_channel_macroexten_set(struct ast_channel *chan, const char *value)
 {
-       ast_copy_string(chan->__do_not_use_macroexten, value, sizeof(chan->__do_not_use_macroexten));
+       ast_copy_string(chan->macroexten, value, sizeof(chan->macroexten));
 }
 
-
 char ast_channel_dtmf_digit_to_emulate(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_dtmf_digit_to_emulate;
+       return chan->dtmf_digit_to_emulate;
 }
 void ast_channel_dtmf_digit_to_emulate_set(struct ast_channel *chan, char value)
 {
-       chan->__do_not_use_dtmf_digit_to_emulate = value;
+       chan->dtmf_digit_to_emulate = value;
 }
-int ast_channel_amaflags(const struct ast_channel *chan)
+
+char ast_channel_sending_dtmf_digit(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_amaflags;
+       return chan->sending_dtmf_digit;
 }
-void ast_channel_amaflags_set(struct ast_channel *chan, int value)
+void ast_channel_sending_dtmf_digit_set(struct ast_channel *chan, char value)
 {
-       chan->__do_not_use_amaflags = value;
+       chan->sending_dtmf_digit = value;
 }
-#ifdef HAVE_EPOLL
-int ast_channel_epfd(const struct ast_channel *chan)
+
+struct timeval ast_channel_sending_dtmf_tv(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_epfd;
+       return chan->sending_dtmf_tv;
 }
-void ast_channel_epfd_set(struct ast_channel *chan, int value)
+void ast_channel_sending_dtmf_tv_set(struct ast_channel *chan, struct timeval value)
 {
-       chan->__do_not_use_epfd = value;
+       chan->sending_dtmf_tv = value;
+}
+
+enum ama_flags ast_channel_amaflags(const struct ast_channel *chan)
+{
+       return chan->amaflags;
+}
+
+void ast_channel_amaflags_set(struct ast_channel *chan, enum ama_flags value)
+{
+       if (chan->amaflags == value) {
+               return;
+       }
+       chan->amaflags = value;
+       ast_channel_publish_snapshot(chan);
 }
-#endif
 int ast_channel_fdno(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_fdno;
+       return chan->fdno;
 }
 void ast_channel_fdno_set(struct ast_channel *chan, int value)
 {
-       chan->__do_not_use_fdno = value;
+       chan->fdno = value;
 }
 int ast_channel_hangupcause(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_hangupcause;
+       return chan->hangupcause;
 }
 void ast_channel_hangupcause_set(struct ast_channel *chan, int value)
 {
-       chan->__do_not_use_hangupcause = value;
+       chan->hangupcause = value;
 }
 int ast_channel_macropriority(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_macropriority;
+       return chan->macropriority;
 }
 void ast_channel_macropriority_set(struct ast_channel *chan, int value)
 {
-       chan->__do_not_use_macropriority = value;
+       chan->macropriority = value;
 }
 int ast_channel_priority(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_priority;
+       return chan->priority;
 }
 void ast_channel_priority_set(struct ast_channel *chan, int value)
 {
-       chan->__do_not_use_priority = value;
+       chan->priority = value;
 }
 int ast_channel_rings(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_rings;
+       return chan->rings;
 }
 void ast_channel_rings_set(struct ast_channel *chan, int value)
 {
-       chan->__do_not_use_rings = value;
+       chan->rings = value;
 }
 int ast_channel_streamid(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_streamid;
+       return chan->streamid;
 }
 void ast_channel_streamid_set(struct ast_channel *chan, int value)
 {
-       chan->__do_not_use_streamid = value;
+       chan->streamid = value;
 }
 int ast_channel_timingfd(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_timingfd;
+       return chan->timingfd;
 }
 void ast_channel_timingfd_set(struct ast_channel *chan, int value)
 {
-       chan->__do_not_use_timingfd = value;
+       chan->timingfd = value;
 }
 int ast_channel_visible_indication(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_visible_indication;
+       return chan->visible_indication;
 }
 void ast_channel_visible_indication_set(struct ast_channel *chan, int value)
 {
-       chan->__do_not_use_visible_indication = value;
+       chan->visible_indication = value;
+}
+int ast_channel_hold_state(const struct ast_channel *chan)
+{
+       return chan->hold_state;
+}
+void ast_channel_hold_state_set(struct ast_channel *chan, int value)
+{
+       chan->hold_state = value;
 }
 int ast_channel_vstreamid(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_vstreamid;
+       return chan->vstreamid;
 }
 void ast_channel_vstreamid_set(struct ast_channel *chan, int value)
 {
-       chan->__do_not_use_vstreamid = value;
+       chan->vstreamid = value;
 }
 unsigned short ast_channel_transfercapability(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_transfercapability;
+       return chan->transfercapability;
 }
 void ast_channel_transfercapability_set(struct ast_channel *chan, unsigned short value)
 {
-       chan->__do_not_use_transfercapability = value;
+       chan->transfercapability = value;
 }
 unsigned int ast_channel_emulate_dtmf_duration(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_emulate_dtmf_duration;
+       return chan->emulate_dtmf_duration;
 }
 void ast_channel_emulate_dtmf_duration_set(struct ast_channel *chan, unsigned int value)
 {
-       chan->__do_not_use_emulate_dtmf_duration = value;
+       chan->emulate_dtmf_duration = value;
 }
 unsigned int ast_channel_fin(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_fin;
+       return chan->fin;
 }
 void ast_channel_fin_set(struct ast_channel *chan, unsigned int value)
 {
-       chan->__do_not_use_fin = value;
+       chan->fin = value;
 }
 unsigned int ast_channel_fout(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_fout;
+       return chan->fout;
 }
 void ast_channel_fout_set(struct ast_channel *chan, unsigned int value)
 {
-       chan->__do_not_use_fout = value;
+       chan->fout = value;
 }
 unsigned long ast_channel_insmpl(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_insmpl;
+       return chan->insmpl;
 }
 void ast_channel_insmpl_set(struct ast_channel *chan, unsigned long value)
 {
-       chan->__do_not_use_insmpl = value;
+       chan->insmpl = value;
 }
 unsigned long ast_channel_outsmpl(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_outsmpl;
+       return chan->outsmpl;
 }
 void ast_channel_outsmpl_set(struct ast_channel *chan, unsigned long value)
 {
-       chan->__do_not_use_outsmpl = value;
+       chan->outsmpl = value;
 }
 void *ast_channel_generatordata(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_generatordata;
+       return chan->generatordata;
 }
 void ast_channel_generatordata_set(struct ast_channel *chan, void *value)
 {
-       chan->__do_not_use_generatordata = value;
+       chan->generatordata = value;
 }
 void *ast_channel_music_state(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_music_state;
+       return chan->music_state;
 }
 void ast_channel_music_state_set(struct ast_channel *chan, void *value)
 {
-       chan->__do_not_use_music_state = value;
+       chan->music_state = value;
 }
 void *ast_channel_tech_pvt(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_tech_pvt;
+       return chan->tech_pvt;
 }
 void ast_channel_tech_pvt_set(struct ast_channel *chan, void *value)
 {
-       chan->__do_not_use_tech_pvt = value;
+       chan->tech_pvt = value;
 }
 void *ast_channel_timingdata(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_timingdata;
+       return chan->timingdata;
 }
 void ast_channel_timingdata_set(struct ast_channel *chan, void *value)
 {
-       chan->__do_not_use_timingdata = value;
+       chan->timingdata = value;
 }
 struct ast_audiohook_list *ast_channel_audiohooks(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_audiohooks;
+       return chan->audiohooks;
 }
 void ast_channel_audiohooks_set(struct ast_channel *chan, struct ast_audiohook_list *value)
 {
-       chan->__do_not_use_audiohooks = value;
+       chan->audiohooks = value;
 }
 struct ast_cdr *ast_channel_cdr(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_cdr;
+       return chan->cdr;
 }
 void ast_channel_cdr_set(struct ast_channel *chan, struct ast_cdr *value)
 {
-       chan->__do_not_use_cdr = value;
+       chan->cdr = value;
 }
 struct ast_channel *ast_channel_masq(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_masq;
+       return chan->masq;
 }
 void ast_channel_masq_set(struct ast_channel *chan, struct ast_channel *value)
 {
-       chan->__do_not_use_masq = value;
+       chan->masq = value;
 }
 struct ast_channel *ast_channel_masqr(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_masqr;
+       return chan->masqr;
 }
 void ast_channel_masqr_set(struct ast_channel *chan, struct ast_channel *value)
 {
-       chan->__do_not_use_masqr = value;
+       chan->masqr = value;
 }
 struct ast_channel_monitor *ast_channel_monitor(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_monitor;
+       return chan->monitor;
 }
 void ast_channel_monitor_set(struct ast_channel *chan, struct ast_channel_monitor *value)
 {
-       chan->__do_not_use_monitor = value;
+       chan->monitor = value;
 }
 struct ast_filestream *ast_channel_stream(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_stream;
+       return chan->stream;
 }
 void ast_channel_stream_set(struct ast_channel *chan, struct ast_filestream *value)
 {
-       chan->__do_not_use_stream = value;
+       chan->stream = value;
 }
 struct ast_filestream *ast_channel_vstream(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_vstream;
+       return chan->vstream;
 }
 void ast_channel_vstream_set(struct ast_channel *chan, struct ast_filestream *value)
 {
-       chan->__do_not_use_vstream = value;
+       chan->vstream = value;
 }
 struct ast_format_cap *ast_channel_nativeformats(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_nativeformats;
+       return chan->nativeformats;
+}
+
+static void channel_set_default_streams(struct ast_channel *chan)
+{
+       enum ast_media_type type;
+
+       ast_assert(chan != NULL);
+
+       for (type = AST_MEDIA_TYPE_UNKNOWN; type < AST_MEDIA_TYPE_END; type++) {
+               if (chan->stream_topology) {
+                       chan->default_streams[type] =
+                               ast_stream_topology_get_first_stream_by_type(chan->stream_topology, type);
+               } else {
+                       chan->default_streams[type] = NULL;
+               }
+       }
+}
+
+void ast_channel_internal_set_stream_topology(struct ast_channel *chan,
+       struct ast_stream_topology *topology)
+{
+       ast_stream_topology_free(chan->stream_topology);
+       chan->stream_topology = topology;
+       channel_set_default_streams(chan);
 }
-void ast_channel_nativeformats_set(struct ast_channel *chan, struct ast_format_cap *value)
+
+void ast_channel_internal_set_stream_topology_change_source(
+       struct ast_channel *chan, void *change_source)
 {
-       chan->__do_not_use_nativeformats = value;
+       chan->stream_topology_change_source = change_source;
+}
+
+void *ast_channel_get_stream_topology_change_source(struct ast_channel *chan)
+{
+       return chan->stream_topology_change_source;
+}
+
+void ast_channel_nativeformats_set(struct ast_channel *chan,
+       struct ast_format_cap *value)
+{
+       ast_assert(chan != NULL);
+
+       ao2_replace(chan->nativeformats, value);
+
+       /* If chan->stream_topology is NULL, the channel is being destroyed
+        * and topology is destroyed.
+        */
+       if (!chan->stream_topology) {
+               return;
+       }
+
+       if (!ast_channel_is_multistream(chan) || !value) {
+               struct ast_stream_topology *new_topology;
+
+               new_topology = ast_stream_topology_create_from_format_cap(value);
+               ast_channel_internal_set_stream_topology(chan, new_topology);
+       }
 }
+
 struct ast_framehook_list *ast_channel_framehooks(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_framehooks;
+       return chan->framehooks;
 }
 void ast_channel_framehooks_set(struct ast_channel *chan, struct ast_framehook_list *value)
 {
-       chan->__do_not_use_framehooks = value;
+       chan->framehooks = value;
 }
 struct ast_generator *ast_channel_generator(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_generator;
+       return chan->generator;
 }
 void ast_channel_generator_set(struct ast_channel *chan, struct ast_generator *value)
 {
-       chan->__do_not_use_generator = value;
+       chan->generator = value;
 }
 struct ast_pbx *ast_channel_pbx(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_pbx;
+       return chan->pbx;
 }
 void ast_channel_pbx_set(struct ast_channel *chan, struct ast_pbx *value)
 {
-       chan->__do_not_use_pbx = value;
+       chan->pbx = value;
 }
 struct ast_sched_context *ast_channel_sched(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_sched;
+       return chan->sched;
 }
 void ast_channel_sched_set(struct ast_channel *chan, struct ast_sched_context *value)
 {
-       chan->__do_not_use_sched = value;
+       chan->sched = value;
 }
 struct ast_timer *ast_channel_timer(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_timer;
+       return chan->timer;
 }
 void ast_channel_timer_set(struct ast_channel *chan, struct ast_timer *value)
 {
-       chan->__do_not_use_timer = value;
+       chan->timer = value;
 }
 struct ast_tone_zone *ast_channel_zone(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_zone;
+       return chan->zone;
 }
 void ast_channel_zone_set(struct ast_channel *chan, struct ast_tone_zone *value)
 {
-       chan->__do_not_use_zone = value;
+       chan->zone = value;
 }
 struct ast_trans_pvt *ast_channel_readtrans(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_readtrans;
+       return chan->readtrans;
 }
 void ast_channel_readtrans_set(struct ast_channel *chan, struct ast_trans_pvt *value)
 {
-       chan->__do_not_use_readtrans = value;
+       chan->readtrans = value;
 }
 struct ast_trans_pvt *ast_channel_writetrans(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_writetrans;
+       return chan->writetrans;
 }
 void ast_channel_writetrans_set(struct ast_channel *chan, struct ast_trans_pvt *value)
 {
-       chan->__do_not_use_writetrans = value;
+       chan->writetrans = value;
 }
 const struct ast_channel_tech *ast_channel_tech(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_tech;
+       return chan->tech;
 }
 void ast_channel_tech_set(struct ast_channel *chan, const struct ast_channel_tech *value)
 {
-       chan->__do_not_use_tech = value;
+       if (value->read_stream || value->write_stream) {
+               ast_assert(value->read_stream && value->write_stream);
+       }
+
+       chan->tech = value;
 }
 enum ast_channel_adsicpe ast_channel_adsicpe(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_adsicpe;
+       return chan->adsicpe;
 }
 void ast_channel_adsicpe_set(struct ast_channel *chan, enum ast_channel_adsicpe value)
 {
-       chan->__do_not_use_adsicpe = value;
+       chan->adsicpe = value;
 }
 enum ast_channel_state ast_channel_state(const struct ast_channel *chan)
 {
-       return chan->__do_not_use_state;
+       return chan->state;
+}
+ast_callid ast_channel_callid(const struct ast_channel *chan)
+{
+       return chan->callid;
 }
+void ast_channel_callid_set(struct ast_channel *chan, ast_callid callid)
+{
+       char call_identifier_from[AST_CALLID_BUFFER_LENGTH];
+       char call_identifier_to[AST_CALLID_BUFFER_LENGTH];
+       call_identifier_from[0] = '\0';
+       ast_callid_strnprint(call_identifier_to, sizeof(call_identifier_to), callid);
+       if (chan->callid) {
+               ast_callid_strnprint(call_identifier_from, sizeof(call_identifier_from), chan->callid);
+               ast_debug(3, "Channel Call ID changing from %s to %s\n", call_identifier_from, call_identifier_to);
+       }
+
+       chan->callid = callid;
+
+       ast_test_suite_event_notify("CallIDChange",
+               "State: CallIDChange\r\n"
+               "Channel: %s\r\n"
+               "CallID: %s\r\n"
+               "PriorCallID: %s",
+               ast_channel_name(chan),
+               call_identifier_to,
+               call_identifier_from);
+}
+
 void ast_channel_state_set(struct ast_channel *chan, enum ast_channel_state value)
 {
-       chan->__do_not_use_state = value;
+       chan->state = value;
+}
+void ast_channel_set_oldwriteformat(struct ast_channel *chan, struct ast_format *format)
+{
+       ao2_replace(chan->oldwriteformat, format);
+}
+void ast_channel_set_rawreadformat(struct ast_channel *chan, struct ast_format *format)
+{
+       ao2_replace(chan->rawreadformat, format);
+}
+void ast_channel_set_rawwriteformat(struct ast_channel *chan, struct ast_format *format)
+{
+       ao2_replace(chan->rawwriteformat, format);
+}
+void ast_channel_set_readformat(struct ast_channel *chan, struct ast_format *format)
+{
+       ao2_replace(chan->readformat, format);
+}
+void ast_channel_set_writeformat(struct ast_channel *chan, struct ast_format *format)
+{
+       ao2_replace(chan->writeformat, format);
 }
 struct ast_format *ast_channel_oldwriteformat(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_oldwriteformat;
+       return chan->oldwriteformat;
 }
 struct ast_format *ast_channel_rawreadformat(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_rawreadformat;
+       return chan->rawreadformat;
 }
 struct ast_format *ast_channel_rawwriteformat(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_rawwriteformat;
+       return chan->rawwriteformat;
 }
 struct ast_format *ast_channel_readformat(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_readformat;
+       return chan->readformat;
 }
 struct ast_format *ast_channel_writeformat(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_writeformat;
+       return chan->writeformat;
+}
+struct ast_hangup_handler_list *ast_channel_hangup_handlers(struct ast_channel *chan)
+{
+       return &chan->hangup_handlers;
 }
 struct ast_datastore_list *ast_channel_datastores(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_datastores;
+       return &chan->datastores;
 }
 struct ast_autochan_list *ast_channel_autochans(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_autochans;
+       return &chan->autochans;
 }
 struct ast_readq_list *ast_channel_readq(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_readq;
+       return &chan->readq;
 }
 struct ast_frame *ast_channel_dtmff(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_dtmff;
+       return &chan->dtmff;
 }
 struct ast_jb *ast_channel_jb(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_jb;
+       return &chan->jb;
 }
 struct ast_party_caller *ast_channel_caller(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_caller;
+       return &chan->caller;
 }
 struct ast_party_connected_line *ast_channel_connected(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_connected;
+       return &chan->connected;
+}
+struct ast_party_connected_line *ast_channel_connected_indicated(struct ast_channel *chan)
+{
+       return &chan->connected_indicated;
+}
+struct ast_party_id ast_channel_connected_effective_id(struct ast_channel *chan)
+{
+       return ast_party_id_merge(&chan->connected.id, &chan->connected.priv);
 }
 struct ast_party_dialed *ast_channel_dialed(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_dialed;
+       return &chan->dialed;
 }
 struct ast_party_redirecting *ast_channel_redirecting(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_redirecting;
+       return &chan->redirecting;
+}
+struct ast_party_id ast_channel_redirecting_effective_orig(struct ast_channel *chan)
+{
+       return ast_party_id_merge(&chan->redirecting.orig, &chan->redirecting.priv_orig);
+}
+struct ast_party_id ast_channel_redirecting_effective_from(struct ast_channel *chan)
+{
+       return ast_party_id_merge(&chan->redirecting.from, &chan->redirecting.priv_from);
+}
+struct ast_party_id ast_channel_redirecting_effective_to(struct ast_channel *chan)
+{
+       return ast_party_id_merge(&chan->redirecting.to, &chan->redirecting.priv_to);
 }
 struct timeval *ast_channel_dtmf_tv(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_dtmf_tv;
+       return &chan->dtmf_tv;
 }
 struct timeval *ast_channel_whentohangup(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_whentohangup;
+       return &chan->whentohangup;
 }
 struct varshead *ast_channel_varshead(struct ast_channel *chan)
 {
-       return &chan->__do_not_use_varshead;
+       return &chan->varshead;
+}
+void ast_channel_dtmff_set(struct ast_channel *chan, struct ast_frame *value)
+{
+       chan->dtmff = *value;
+}
+void ast_channel_jb_set(struct ast_channel *chan, struct ast_jb *value)
+{
+       chan->jb = *value;
 }
 void ast_channel_caller_set(struct ast_channel *chan, struct ast_party_caller *value)
 {
-       chan->__do_not_use_caller = *value;
+       chan->caller = *value;
 }
 void ast_channel_connected_set(struct ast_channel *chan, struct ast_party_connected_line *value)
 {
-       chan->__do_not_use_connected = *value;
+       chan->connected = *value;
 }
 void ast_channel_dialed_set(struct ast_channel *chan, struct ast_party_dialed *value)
 {
-       chan->__do_not_use_dialed = *value;
+       chan->dialed = *value;
 }
 void ast_channel_redirecting_set(struct ast_channel *chan, struct ast_party_redirecting *value)
 {
-       chan->__do_not_use_redirecting = *value;
+       chan->redirecting = *value;
 }
 void ast_channel_dtmf_tv_set(struct ast_channel *chan, struct timeval *value)
 {
-       chan->__do_not_use_dtmf_tv = *value;
+       chan->dtmf_tv = *value;
 }
 void ast_channel_whentohangup_set(struct ast_channel *chan, struct timeval *value)
 {
-       chan->__do_not_use_whentohangup = *value;
+       chan->whentohangup = *value;
+}
+void ast_channel_varshead_set(struct ast_channel *chan, struct varshead *value)
+{
+       chan->varshead = *value;
+}
+struct timeval ast_channel_creationtime(struct ast_channel *chan)
+{
+       return chan->creationtime;
+}
+void ast_channel_creationtime_set(struct ast_channel *chan, struct timeval *value)
+{
+       chan->creationtime = *value;
+}
+
+struct timeval ast_channel_answertime(struct ast_channel *chan)
+{
+       return chan->answertime;
+}
+
+void ast_channel_answertime_set(struct ast_channel *chan, struct timeval *value)
+{
+       chan->answertime = *value;
+}
+
+/* Evil softhangup accessors */
+int ast_channel_softhangup_internal_flag(struct ast_channel *chan)
+{
+       return chan->softhangup;
+}
+void ast_channel_softhangup_internal_flag_set(struct ast_channel *chan, int value)
+{
+       chan->softhangup = value;
+}
+void ast_channel_softhangup_internal_flag_add(struct ast_channel *chan, int value)
+{
+       chan->softhangup |= value;
+}
+void ast_channel_softhangup_internal_flag_clear(struct ast_channel *chan, int value)
+{
+       chan ->softhangup &= ~value;
+}
+
+int ast_channel_unbridged_nolock(struct ast_channel *chan)
+{
+       return chan->unbridged;
+}
+
+int ast_channel_unbridged(struct ast_channel *chan)
+{
+       int res;
+       ast_channel_lock(chan);
+       res = ast_channel_unbridged_nolock(chan);
+       ast_channel_unlock(chan);
+       return res;
+}
+
+void ast_channel_set_unbridged_nolock(struct ast_channel *chan, int value)
+{
+       chan->unbridged = !!value;
+       ast_queue_frame(chan, &ast_null_frame);
+}
+
+void ast_channel_set_unbridged(struct ast_channel *chan, int value)
+{
+       ast_channel_lock(chan);
+       ast_channel_set_unbridged_nolock(chan, value);
+       ast_channel_unlock(chan);
+}
+
+int ast_channel_is_t38_active_nolock(struct ast_channel *chan)
+{
+       return chan->is_t38_active;
+}
+
+int ast_channel_is_t38_active(struct ast_channel *chan)
+{
+       int res;
+
+       ast_channel_lock(chan);
+       res = ast_channel_is_t38_active_nolock(chan);
+       ast_channel_unlock(chan);
+       return res;
+}
+
+void ast_channel_set_is_t38_active_nolock(struct ast_channel *chan, int is_t38_active)
+{
+       chan->is_t38_active = !!is_t38_active;
+}
+
+void ast_channel_set_is_t38_active(struct ast_channel *chan, int is_t38_active)
+{
+       ast_channel_lock(chan);
+       ast_channel_set_is_t38_active_nolock(chan, is_t38_active);
+       ast_channel_unlock(chan);
+}
+
+void ast_channel_callid_cleanup(struct ast_channel *chan)
+{
+       chan->callid = 0;
+}
+
+/* Typedef accessors */
+ast_group_t ast_channel_callgroup(const struct ast_channel *chan)
+{
+       return chan->callgroup;
+}
+void ast_channel_callgroup_set(struct ast_channel *chan, ast_group_t value)
+{
+       chan->callgroup = value;
+}
+ast_group_t ast_channel_pickupgroup(const struct ast_channel *chan)
+{
+       return chan->pickupgroup;
+}
+void ast_channel_pickupgroup_set(struct ast_channel *chan, ast_group_t value)
+{
+       chan->pickupgroup = value;
+}
+struct ast_namedgroups *ast_channel_named_callgroups(const struct ast_channel *chan)
+{
+       return chan->named_callgroups;
+}
+void ast_channel_named_callgroups_set(struct ast_channel *chan, struct ast_namedgroups *value)
+{
+       ast_unref_namedgroups(chan->named_callgroups);
+       chan->named_callgroups = ast_ref_namedgroups(value);
+}
+struct ast_namedgroups *ast_channel_named_pickupgroups(const struct ast_channel *chan)
+{
+       return chan->named_pickupgroups;
+}
+void ast_channel_named_pickupgroups_set(struct ast_channel *chan, struct ast_namedgroups *value)
+{
+       ast_unref_namedgroups(chan->named_pickupgroups);
+       chan->named_pickupgroups = ast_ref_namedgroups(value);
+}
+
+/* Alertpipe functions */
+int ast_channel_alert_write(struct ast_channel *chan)
+{
+       return ast_alertpipe_write(chan->alertpipe);
+}
+
+ast_alert_status_t ast_channel_internal_alert_flush(struct ast_channel *chan)
+{
+       return ast_alertpipe_flush(chan->alertpipe);
+}
+
+ast_alert_status_t ast_channel_internal_alert_read(struct ast_channel *chan)
+{
+       return ast_alertpipe_read(chan->alertpipe);
+}
+
+int ast_channel_alert_writable(struct ast_channel *chan)
+{
+       return ast_alertpipe_writable(chan->alertpipe);
+}
+
+int ast_channel_internal_alert_readable(struct ast_channel *chan)
+{
+       return ast_alertpipe_readable(chan->alertpipe);
+}
+
+void ast_channel_internal_alertpipe_clear(struct ast_channel *chan)
+{
+       ast_alertpipe_clear(chan->alertpipe);
+}
+
+void ast_channel_internal_alertpipe_close(struct ast_channel *chan)
+{
+       ast_alertpipe_close(chan->alertpipe);
+}
+
+int ast_channel_internal_alertpipe_init(struct ast_channel *chan)
+{
+       return ast_alertpipe_init(chan->alertpipe);
+}
+
+int ast_channel_internal_alert_readfd(struct ast_channel *chan)
+{
+       return ast_alertpipe_readfd(chan->alertpipe);
+}
+
+void ast_channel_internal_alertpipe_swap(struct ast_channel *chan1, struct ast_channel *chan2)
+{
+       ast_alertpipe_swap(chan1->alertpipe, chan2->alertpipe);
+}
+
+/* file descriptor array accessors */
+void ast_channel_internal_fd_set(struct ast_channel *chan, int which, int value)
+{
+       int pos;
+
+       /* This ensures that if the vector has to grow with unused positions they will be
+        * initialized to -1.
+        */
+       for (pos = AST_VECTOR_SIZE(&chan->fds); pos < which; pos++) {
+               AST_VECTOR_REPLACE(&chan->fds, pos, -1);
+       }
+
+       AST_VECTOR_REPLACE(&chan->fds, which, value);
+}
+void ast_channel_internal_fd_clear(struct ast_channel *chan, int which)
+{
+       if (which >= AST_VECTOR_SIZE(&chan->fds)) {
+               return;
+       }
+
+       AST_VECTOR_REPLACE(&chan->fds, which, -1);
+}
+void ast_channel_internal_fd_clear_all(struct ast_channel *chan)
+{
+       AST_VECTOR_RESET(&chan->fds, AST_VECTOR_ELEM_CLEANUP_NOOP);
+}
+int ast_channel_fd(const struct ast_channel *chan, int which)
+{
+       return (which >= AST_VECTOR_SIZE(&chan->fds)) ? -1 : AST_VECTOR_GET(&chan->fds, which);
+}
+int ast_channel_fd_isset(const struct ast_channel *chan, int which)
+{
+       return ast_channel_fd(chan, which) > -1;
+}
+
+int ast_channel_fd_count(const struct ast_channel *chan)
+{
+       return AST_VECTOR_SIZE(&chan->fds);
+}
+
+int ast_channel_fd_add(struct ast_channel *chan, int value)
+{
+       int pos = AST_EXTENDED_FDS;
+
+       while (ast_channel_fd_isset(chan, pos)) {
+               pos += 1;
+       }
+
+       AST_VECTOR_REPLACE(&chan->fds, pos, value);
+
+       return pos;
+}
+
+pthread_t ast_channel_blocker(const struct ast_channel *chan)
+{
+       return chan->blocker;
+}
+void ast_channel_blocker_set(struct ast_channel *chan, pthread_t value)
+{
+       chan->blocker = value;
+}
+
+ast_timing_func_t ast_channel_timingfunc(const struct ast_channel *chan)
+{
+       return chan->timingfunc;
+}
+void ast_channel_timingfunc_set(struct ast_channel *chan, ast_timing_func_t value)
+{
+       chan->timingfunc = value;
+}
+
+struct ast_bridge *ast_channel_internal_bridge(const struct ast_channel *chan)
+{
+       return chan->bridge;
+}
+void ast_channel_internal_bridge_set(struct ast_channel *chan, struct ast_bridge *value)
+{
+       chan->bridge = value;
+       ast_channel_publish_snapshot(chan);
+}
+
+struct ast_bridge_channel *ast_channel_internal_bridge_channel(const struct ast_channel *chan)
+{
+       return chan->bridge_channel;
+}
+void ast_channel_internal_bridge_channel_set(struct ast_channel *chan, struct ast_bridge_channel *value)
+{
+       chan->bridge_channel = value;
+}
+
+struct ast_flags *ast_channel_flags(struct ast_channel *chan)
+{
+       return &chan->flags;
+}
+
+static int collect_names_cb(void *obj, void *arg, int flags) {
+       struct ast_control_pvt_cause_code *cause_code = obj;
+       struct ast_str **str = arg;
+
+       ast_str_append(str, 0, "%s%s", (ast_str_strlen(*str) ? "," : ""), cause_code->chan_name);
+
+       return 0;
+}
+
+struct ast_str *ast_channel_dialed_causes_channels(const struct ast_channel *chan)
+{
+       struct ast_str *chanlist = ast_str_create(128);
+
+       if (!chanlist) {
+               return NULL;
+       }
+
+       ao2_callback(chan->dialed_causes, 0, collect_names_cb, &chanlist);
+
+       return chanlist;
+}
+
+struct ast_control_pvt_cause_code *ast_channel_dialed_causes_find(const struct ast_channel *chan, const char *chan_name)
+{
+       return ao2_find(chan->dialed_causes, chan_name, OBJ_KEY);
+}
+
+int ast_channel_dialed_causes_add(const struct ast_channel *chan, const struct ast_control_pvt_cause_code *cause_code, int datalen)
+{
+       struct ast_control_pvt_cause_code *ao2_cause_code;
+       ao2_find(chan->dialed_causes, cause_code->chan_name, OBJ_KEY | OBJ_UNLINK | OBJ_NODATA);
+       ao2_cause_code = ao2_alloc(datalen, NULL);
+
+       if (ao2_cause_code) {
+               memcpy(ao2_cause_code, cause_code, datalen);
+               ao2_link(chan->dialed_causes, ao2_cause_code);
+               ao2_ref(ao2_cause_code, -1);
+               return 0;
+       } else {
+               return -1;
+       }
+}
+
+void ast_channel_dialed_causes_clear(const struct ast_channel *chan)
+{
+       ao2_callback(chan->dialed_causes, OBJ_UNLINK | OBJ_NODATA | OBJ_MULTIPLE, NULL, NULL);
+}
+
+/* \brief Hash function for pvt cause code frames */
+static int pvt_cause_hash_fn(const void *vpc, const int flags)
+{
+       const struct ast_control_pvt_cause_code *pc = vpc;
+       return ast_str_hash(ast_tech_to_upper(ast_strdupa(pc->chan_name)));
+}
+
+/* \brief Comparison function for pvt cause code frames */
+static int pvt_cause_cmp_fn(void *obj, void *vstr, int flags)
+{
+       struct ast_control_pvt_cause_code *pc = obj;
+       char *str = ast_tech_to_upper(ast_strdupa(vstr));
+       char *pc_str = ast_tech_to_upper(ast_strdupa(pc->chan_name));
+       return !strcmp(pc_str, str) ? CMP_MATCH | CMP_STOP : 0;
+}
+
+#define DIALED_CAUSES_BUCKETS 37
+
+struct ast_channel *__ast_channel_internal_alloc(void (*destructor)(void *obj), const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *file, int line, const char *function)
+{
+       struct ast_channel *tmp;
+
+       tmp = __ao2_alloc(sizeof(*tmp), destructor,
+               AO2_ALLOC_OPT_LOCK_MUTEX, "", file, line, function);
+
+       if (!tmp) {
+               return NULL;
+       }
+
+       if ((ast_string_field_init(tmp, 128))) {
+               return ast_channel_unref(tmp);
+       }
+
+       if (!(tmp->dialed_causes = ao2_container_alloc(DIALED_CAUSES_BUCKETS, pvt_cause_hash_fn, pvt_cause_cmp_fn))) {
+               return ast_channel_unref(tmp);
+       }
+
+       /* set the creation time in the uniqueid */
+       tmp->uniqueid.creation_time = time(NULL);
+       tmp->uniqueid.creation_unique = ast_atomic_fetchadd_int(&uniqueint, 1);
+
+       /* use provided id or default to historical {system-}time.# format */
+       if (assignedids && !ast_strlen_zero(assignedids->uniqueid)) {
+               ast_copy_string(tmp->uniqueid.unique_id, assignedids->uniqueid, sizeof(tmp->uniqueid.unique_id));
+       } else if (ast_strlen_zero(ast_config_AST_SYSTEM_NAME)) {
+               snprintf(tmp->uniqueid.unique_id, sizeof(tmp->uniqueid.unique_id), "%li.%d",
+                       (long)(tmp->uniqueid.creation_time),
+                       tmp->uniqueid.creation_unique);
+       } else {
+               snprintf(tmp->uniqueid.unique_id, sizeof(tmp->uniqueid.unique_id), "%s-%li.%d",
+                       ast_config_AST_SYSTEM_NAME,
+                       (long)(tmp->uniqueid.creation_time),
+                       tmp->uniqueid.creation_unique);
+       }
+
+       /* copy linked id from parent channel if known */
+       if (requestor) {
+               tmp->linkedid = requestor->linkedid;
+       } else {
+               tmp->linkedid = tmp->uniqueid;
+       }
+
+       AST_VECTOR_INIT(&tmp->fds, AST_MAX_FDS);
+
+       return tmp;
+}
+
+struct ast_channel *ast_channel_internal_oldest_linkedid(struct ast_channel *a, struct ast_channel *b)
+{
+       ast_assert(a->linkedid.creation_time != 0);
+       ast_assert(b->linkedid.creation_time != 0);
+
+       if (a->linkedid.creation_time < b->linkedid.creation_time) {
+               return a;
+       }
+       if (b->linkedid.creation_time < a->linkedid.creation_time) {
+               return b;
+       }
+       if (a->linkedid.creation_unique < b->linkedid.creation_unique) {
+               return a;
+       }
+       return b;
+}
+
+void ast_channel_internal_copy_linkedid(struct ast_channel *dest, struct ast_channel *source)
+{
+       if (dest->linkedid.creation_time == source->linkedid.creation_time
+               && dest->linkedid.creation_unique == source->linkedid.creation_unique
+               && !strcmp(dest->linkedid.unique_id, source->linkedid.unique_id)) {
+               return;
+       }
+       dest->linkedid = source->linkedid;
+       ast_channel_publish_snapshot(dest);
+}
+
+void ast_channel_internal_swap_uniqueid_and_linkedid(struct ast_channel *a, struct ast_channel *b)
+{
+       struct ast_channel_id temp;
+
+       temp = a->uniqueid;
+       a->uniqueid = b->uniqueid;
+       b->uniqueid = temp;
+
+       temp = a->linkedid;
+       a->linkedid = b->linkedid;
+       b->linkedid = temp;
+}
+
+void ast_channel_internal_swap_topics(struct ast_channel *a, struct ast_channel *b)
+{
+       struct stasis_cp_single *temp;
+
+       temp = a->topics;
+       a->topics = b->topics;
+       b->topics = temp;
+}
+
+void ast_channel_internal_set_fake_ids(struct ast_channel *chan, const char *uniqueid, const char *linkedid)
+{
+       ast_copy_string(chan->uniqueid.unique_id, uniqueid, sizeof(chan->uniqueid.unique_id));
+       ast_copy_string(chan->linkedid.unique_id, linkedid, sizeof(chan->linkedid.unique_id));
+}
+
+void ast_channel_internal_cleanup(struct ast_channel *chan)
+{
+       if (chan->dialed_causes) {
+               ao2_t_ref(chan->dialed_causes, -1,
+                       "done with dialed causes since the channel is going away");
+               chan->dialed_causes = NULL;
+       }
+
+       ast_string_field_free_memory(chan);
+
+       chan->endpoint_forward = stasis_forward_cancel(chan->endpoint_forward);
+       chan->endpoint_cache_forward = stasis_forward_cancel(chan->endpoint_cache_forward);
+
+       stasis_cp_single_unsubscribe(chan->topics);
+       chan->topics = NULL;
+
+       ast_channel_internal_set_stream_topology(chan, NULL);
+
+       AST_VECTOR_FREE(&chan->fds);
+}
+
+void ast_channel_internal_finalize(struct ast_channel *chan)
+{
+       chan->finalized = 1;
+}
+
+int ast_channel_internal_is_finalized(struct ast_channel *chan)
+{
+       return chan->finalized;
+}
+
+struct stasis_topic *ast_channel_topic(struct ast_channel *chan)
+{
+       if (!chan) {
+               return ast_channel_topic_all();
+       }
+
+       return stasis_cp_single_topic(chan->topics);
+}
+
+struct stasis_topic *ast_channel_topic_cached(struct ast_channel *chan)
+{
+       if (!chan) {
+               return ast_channel_topic_all_cached();
+       }
+
+       return stasis_cp_single_topic_cached(chan->topics);
+}
+
+int ast_channel_forward_endpoint(struct ast_channel *chan,
+       struct ast_endpoint *endpoint)
+{
+       ast_assert(chan != NULL);
+       ast_assert(endpoint != NULL);
+
+       chan->endpoint_forward =
+               stasis_forward_all(ast_channel_topic(chan),
+                       ast_endpoint_topic(endpoint));
+       if (!chan->endpoint_forward) {
+               return -1;
+       }
+
+       chan->endpoint_cache_forward = stasis_forward_all(ast_channel_topic_cached(chan),
+               ast_endpoint_topic(endpoint));
+       if (!chan->endpoint_cache_forward) {
+               chan->endpoint_forward = stasis_forward_cancel(chan->endpoint_forward);
+               return -1;
+       }
+
+       return 0;
+}
+
+int ast_channel_internal_setup_topics(struct ast_channel *chan)
+{
+       const char *topic_name = chan->uniqueid.unique_id;
+       ast_assert(chan->topics == NULL);
+
+       if (ast_strlen_zero(topic_name)) {
+               topic_name = "<dummy-channel>";
+       }
+
+       chan->topics = stasis_cp_single_create(
+               ast_channel_cache_all(), topic_name);
+       if (!chan->topics) {
+               return -1;
+       }
+
+       return 0;
+}
+
+AST_THREADSTORAGE(channel_errno);
+
+void ast_channel_internal_errno_set(enum ast_channel_error error)
+{
+       enum ast_channel_error *error_code = ast_threadstorage_get(&channel_errno, sizeof(*error_code));
+       if (!error_code) {
+               return;
+       }
+
+       *error_code = error;
+}
+
+enum ast_channel_error ast_channel_internal_errno(void)
+{
+       enum ast_channel_error *error_code = ast_threadstorage_get(&channel_errno, sizeof(*error_code));
+       if (!error_code) {
+               return AST_CHANNEL_ERROR_UNKNOWN;
+       }
+
+       return *error_code;
+}
+
+struct ast_stream_topology *ast_channel_get_stream_topology(
+       const struct ast_channel *chan)
+{
+       ast_assert(chan != NULL);
+
+       return chan->stream_topology;
+}
+
+struct ast_stream_topology *ast_channel_set_stream_topology(struct ast_channel *chan,
+       struct ast_stream_topology *topology)
+{
+       struct ast_stream_topology *new_topology;
+
+       ast_assert(chan != NULL);
+
+       /* A non-MULTISTREAM channel can't manipulate topology directly */
+       ast_assert(ast_channel_is_multistream(chan));
+
+       /* Unless the channel is being destroyed, we always want a topology on
+        * it even if its empty.
+        */
+       if (!topology) {
+               new_topology = ast_stream_topology_alloc();
+       } else {
+               new_topology = topology;
+       }
+
+       if (new_topology) {
+               ast_channel_internal_set_stream_topology(chan, new_topology);
+       }
+
+       return new_topology;
+}
+
+struct ast_stream *ast_channel_get_default_stream(struct ast_channel *chan,
+       enum ast_media_type type)
+{
+       ast_assert(chan != NULL);
+       ast_assert(type < AST_MEDIA_TYPE_END);
+
+       return chan->default_streams[type];
+}
+
+void ast_channel_internal_swap_stream_topology(struct ast_channel *chan1,
+       struct ast_channel *chan2)
+{
+       struct ast_stream_topology *tmp_topology;
+
+       ast_assert(chan1 != NULL && chan2 != NULL);
+
+       tmp_topology = chan1->stream_topology;
+       chan1->stream_topology = chan2->stream_topology;
+       chan2->stream_topology = tmp_topology;
+
+       channel_set_default_streams(chan1);
+       channel_set_default_streams(chan2);
+}
+
+int ast_channel_is_multistream(struct ast_channel *chan)
+{
+       return (chan->tech && chan->tech->read_stream && chan->tech->write_stream);
 }