Update UPGRADE.txt file for Asterisk 12

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===
=== Information for upgrading between Asterisk versions
===
=== These files document all the changes that MUST be taken
=== into account when upgrading between the Asterisk
=== versions listed below. These changes may require that
=== you modify your configuration files, dialplan or (in
=== some cases) source code if you have your own Asterisk
=== modules or patches. These files also include advance
=== notice of any functionality that has been marked as
=== 'deprecated' and may be removed in a future release,
=== along with the suggested replacement functionality.
===
=== UPGRADE-1.2.txt -- Upgrade info for 1.0 to 1.2
=== UPGRADE-1.4.txt -- Upgrade info for 1.2 to 1.4
=== UPGRADE-1.6.txt -- Upgrade info for 1.4 to 1.6
=== UPGRADE-1.8.txt -- Upgrade info for 1.6 to 1.8
=== UPGRADE-10.txt  -- Upgrade info for 1.8 to 10
=== UPGRADE-11.txt  -- Upgrade info for 10 to 11
===
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There are many significant architectural changes in Asterisk 12. It is
recommended that you not only read through this document for important
changes that affect an upgrade, but that you also read through the CHANGES
document in depth to better understand the new options available to you.

Additional information on the architectural changes made in Asterisk can be
found on the Asterisk wiki (https://wiki.asterisk.org)

Of particular note, the following systems in Asterisk underwent significant
changes. Documentation for the changes and a specification for their
behavior in Asterisk 12 is also available on the Asterisk wiki.
 - AMI: Many events were changed, and the semantics of channels and bridges
        were defined. In particular, how channels and bridges behave under
        transfer scenarios and situations involving multiple parties has
        changed significantly. See https://wiki.asterisk.org/wiki/x/dAFRAQ
        for more information.
 - CDR: CDR logic was extracted from the many locations it existed in across
        Asterisk and implemented as a consumer of Stasis message bus events.
        As a result, consistency of records has improved significantly and the
        behavior of CDRs in transfer scenarios has been defined in the CDR
        specification. However, significant behavioral changes in CDRs resulted
        from the transition. The most significant change is the addition of
        CDR entries when a channel who is the Party A in a CDR leaves a bridge.
        See https://wiki.asterisk.org/wiki/x/pwpRAQ for more information.
 - CEL: Much like CDRs, CEL was removed from the many locations it existed in
        across Asterisk and implemented as a consumer of Stasis message bus
        events. It now closely follows the Bridging API model of channels and
        bridges, and has a much closer consistency of conveyed events as AMI.
        For the changes in events, see https://wiki.asterisk.org/wiki/x/4ICLAQ.

Build System:
 - Removed the CHANNEL_TRACE development mode build option. Certain aspects of
   the CHANNEL_TRACE build option were incompatible with the new bridging
   architecture.

 - Asterisk now depends on libjansson, libuuid and optionally (but recommended)
   libxslt and uriparser.

 - The new SIP stack and channel driver uses a particular version of PJSIP.
   Please see https://wiki.asterisk.org/wiki/x/J4GLAQ for more information on
   configuring and installing PJSIP for use with Asterisk.

AgentLogin and chan_agent:
 - Along with AgentRequest, this application has been modified to be a
   replacement for chan_agent. The chan_agent module and the Agent channel
   driver have been removed from Asterisk, as the concept of a channel driver
   proxying in front of another channel driver was incompatible with the new
   architecture (and has had numerous problems through past versions of
   Asterisk). The act of a channel calling the AgentLogin application places the
   channel into a pool of agents that can be requested by the AgentRequest
   application. Note that this application, as well as all other agent related
   functionality, is now provided by the app_agent_pool module.

 - This application no longer performs agent authentication. If authentication
   is desired, the dialplan needs to perform this function using the
   Authenticate or VMAuthenticate application or through an AGI script before
   running AgentLogin.

 - The agents.conf schema has changed. Rather than specifying agents on a
   single line in comma delineated fashion, each agent is defined in a separate
   context. This allows agents to use the power of context templates in their
   definition.

 - A number of parameters from agents.conf have been removed. This includes
   maxloginretries, autologoffunavail, updatecdr, goodbye, group, recordformat,
   urlprefix, and savecallsin. These options were obsoleted by the move from
   a channel driver model to the bridging/application model provided by
   app_agent_pool.

 - The AGENTUPDATECDR channel variable has also been removed, for the same
   reason as the updatecdr option.

 - The endcall and enddtmf configuration options are removed.  Use the
   dialplan function CHANNEL(dtmf-features) to set DTMF features on the agent
   channel before calling AgentLogin.

AgentMonitorOutgoing
 - This application has been removed. It was a holdover from when
   AgentCallbackLogin was removed.

ControlPlayback
 - The channel variable CPLAYBACKSTATUS may now return the value
   'REMOTESTOPPED' when playback is stopped by an external entity.

DumpChan:
 - The output of DumpChan no longer includes the DirectBridge or IndirectBridge
   fields. Instead, if a channel is in a bridge, it includes a BridgeID field
   containing the unique ID of the bridge that the channel happens to be in.

ForkCDR:
 - Nearly every parameter in ForkCDR has been updated and changed to reflect
   the changes in CDRs. Please see the documentation for the ForkCDR
   application, as well as the CDR specification on the Asterisk wiki.

NoCDR:
 - The NoCDR application has been deprecated. Please use the CDR_PROP function
   to disable CDRs on a channel.

ParkAndAnnounce:
 - The app_parkandannounce module has been removed. The application
   ParkAndAnnounce is now provided by the res_parking module. See the
   Parking changes for more information.

ResetCDR:
 - The 'w' and 'a' options have been removed. Dispatching CDRs to registered
   backends occurs on an as-needed basis in order to preserve linkedid
   propagation and other needed behavior.
 - The 'e' option is deprecated. Please use the CDR_PROP function to enable
   CDRs on a channel that they were previously disabled on.
 - The ResetCDR application is no longer a part of core Asterisk, and instead
   is now delivered as part of app_cdr.

Queues:
 - Queue strategy rrmemory now has a predictable order similar to strategy
   rrordered. Members will be called in the order that they are added to the
   queue.

 - Removed the queues.conf check_state_unknown option.  It is no longer
   necessary.

 - It is now possible to play the Queue prompts to the first user waiting in a
   call queue. Note that this may impact the ability for agents to talk with
   users, as a prompt may still be playing when an agent connects to the user.
   This ability is disabled by default but can be enabled on an individual
   queue using the 'announce-to-first-user' option.

 - The configuration options eventwhencalled and eventmemberstatus have been
   removed.  As a result, the AMI events QueueMemberStatus, AgentCalled,
   AgentConnect, AgentComplete, AgentDump, and AgentRingNoAnswer will always be
   sent.  The "Variable" fields will also no longer exist on the Agent* events.
   These events can be filtered out from a connected AMI client using the
   eventfilter setting in manager.conf.

 - The queue log now differentiates between blind and attended transfers. A
   blind transfer will result in a BLINDTRANSFER message with the destination
   context and extension. An attended transfer will result in an
   ATTENDEDTRANSFER message. This message will indicate the method by which
   the attended transfer was completed: "BRIDGE" for a bridge merge, "APP"
   for running an application on a bridge or channel, or "LINK" for linking
   two bridges together with local channels. The queue log will also now detect
   externally initiated blind and attended transfers and record the transfer
   status accordingly.

 - When performing queue pause/unpause on an interface without specifying an
   individual queue, the PAUSEALL/UNPAUSEALL event will only be logged if at
   least one member of any queue exists for that interface.

SetAMAFlags
 - This application is deprecated in favor of CHANNEL(amaflags).

VoiceMail:
 - The voicemail.conf configuration file now has an 'alias' configuration
   parameter for use with the Directory application. The voicemail realtime
   database table schema has also been updated with an 'alias' column. Systems
   using voicemail with realtime should update their schemas accordingly.

Channel Drivers:
 - When a channel driver is configured to enable jiterbuffers, they are now
   applied unconditionally when a channel joins a bridge. If a jitterbuffer
   is already set for that channel when it enters, such as by the JITTERBUFFER
   function, then the existing jitterbuffer will be used and the one set by
   the channel driver will not be applied.

chan_bridge
 - chan_bridge is removed and its functionality is incorporated into ConfBridge
   itself.

chan_dahdi:
 - Analog port dialing and deferred DTMF dialing for PRI now distinguishes
   between 'w' and 'W'.  The 'w' pauses dialing for half a second.  The 'W'
   pauses dialing for one second.

 - The default for inband_on_proceeding has changed to no.

 - The CLI command 'dahdi destroy channel' is now 'dahdi destroy channels'.
   A range of channels can be specified to be destroyed. Note that this command
   should only be used if you understand the risks it entails.

chan_local:
 - The /b option has been removed.

 - chan_local moved into the system core and is no longer a loadable module.

chan_sip:
 - The 'callevents' parameter has been removed. Hold AMI events are now raised
   in the core, and can be filtered out using the 'eventfilter' parameter
   in manager.conf.

 - Dynamic realtime tables for SIP Users can now include a 'path' field. This
   will store the path information for that peer when it registers. Realtime
   tables can also use the 'supportpath' field to enable Path header support.

 - LDAP realtime configurations for SIP Users now have the AstAccountPathSupport
   objectIdentifier. This maps to the supportpath option in sip.conf.

Core:
 - Masquerades as an operation inside Asterisk have been effectively hidden
   by the migration to the Bridging API. As such, many 'quirks' of Asterisk
   no longer occur. This includes renaming of channels, "<ZOMBIE>" channels,
   dropping of frame/audio hooks, and other internal implementation details
   that users had to deal with. This fundamental change has large implications
   throughout the changes documented for this version. For more information
   about the new core architecture of Asterisk, please see the Asterisk wiki.

 - The following channel variables have changed behavior which is described in
   the CHANGES file: TRANSFER_CONTEXT, BRIDGEPEER, BRIDGEPVTCALLID,
   ATTENDED_TRANSFER_COMPLETE_SOUND, DYNAMIC_FEATURENAME, and DYNAMIC_PEERNAME.

AMI (Asterisk Manager Interface):
 - Version 1.4 - The details of what happens to a channel when a masquerade
   happens (transfers, parking, etc) have changed.
   - The Masquerade event now includes the Uniqueid's of the clone and original
     channels.
   - Channels no longer swap Uniqueid's as a result of the masquerade.
   - Instead of a shell game of renames, there's now a single rename, appending
     <ZOMBIE> to the name of the original channel.

 - *Major* changes were made to both the syntax as well as the semantics of the
   AMI protocol. In particular, AMI events have been substantially modified
   and improved in this version of Asterisk. The major event changes are listed
   below.
   - NewPeerAccount has been removed. NewAccountCode is raised instead.
   - Reload events have been consolidated and standardized.
   - ModuleLoadReport has been removed.
   - FaxSent is now SendFAX; FaxReceived is now ReceiveFAX. This standardizes
     app_fax and res_fax events.
   - MusicOnHold has been replaced with MusicOnHoldStart and MusicOnHoldStop.
   - JabberEvent has been removed.
   - Hold is now in the core and will now raise Hold and Unhold events.
   - Join is now QueueCallerJoin.
   - Leave is now QueueCallerLeave.
   - Agentlogin/Agentlogoff is now AgentLogin/AgentLogoff, respectively.
   - ChannelUpdate has been removed.
   - Local channel optimization is now conveyed via LocalOptimizationBegin and
     LocalOptimizationEnd.
   - BridgeAction and BridgeExec have been removed.
   - BlindTransfer and AttendedTransfer events were added.
   - Dial is now DialBegin and DialEnd.
   - DTMF is now DTMFBegin and DTMFEnd.
   - Bridge has been replaced with BridgeCreate, BridgeEnter, BridgeLeave, and
     BridgeDestroy
   - MusicOnHold has been replaced with MusicOnHoldStart and MusicOnHoldStop
   - AGIExec is now AGIExecStart and AGIExecEnd
   - AsyncAGI is now AsyncAGIStart, AsyncAGIExec, and AsyncAGIEnd

 - The 'MCID' AMI event now publishes a channel snapshot when available and
   its non-channel-snapshot parameters now use either the "MCallerID" or
   'MConnectedID' prefixes with Subaddr*, Name*, and Num* suffixes instead
   of 'CallerID' and 'ConnectedID' to avoid confusion with similarly named
   parameters in the channel snapshot.

 - The 'Channel' key used in the 'AlarmClear', 'Alarm', and 'DNDState' has been
   renamed "DAHDIChannel" since it does not convey an Asterisk channel name.

 - All AMI events now contain a 'SystemName' field, if available.

 - Local channel information in events is now prefixed with 'LocalOne' and
   'LocalTwo'. This replaces the suffix of '1' and '2' for the two halves of
   the Local channel. This affects the 'LocalBridge', 'LocalOptimizationBegin',
   and 'LocalOptimizationEnd' events.

 - The 'RTCPSent'/'RTCPReceived' events have been significantly modified from
   previous versions. They now report all SR/RR packets sent/received, and
   have been restructured to better reflect the data sent in a SR/RR. In
   particular, the event structure now supports multiple report blocks.

 - The deprecated use of | (pipe) as a separator in the channelvars setting in
   manager.conf has been removed.

 - The SIP SIPqualifypeer action now sends a response indicating it will qualify
   a peer once a peer has been found to qualify.  Once the qualify has been
   completed it will now issue a SIPqualifypeerdone event.

 - The AMI event 'Newexten' field 'Extension' is deprecated, and may be removed
   in a future release. Please use the common 'Exten' field instead.

 - The AMI events 'ParkedCall', 'ParkedCallTimeOut', 'ParkedCallGiveUp', and
   'UnParkedCall' have changed significantly in the new res_parking module.
   - The 'Channel' and 'From' headers are gone. For the channel that was parked
     or is coming out of parking, a 'Parkee' channel snapshot is issued and it
     has a number of fields associated with it. The old 'Channel' header relayed
     the same data as the new 'ParkeeChannel' header.
   - The 'From' field was ambiguous and changed meaning depending on the event.
     for most of these, it was the name of the channel that parked the call
     (the 'Parker'). There is no longer a header that provides this channel name,
     however the 'ParkerDialString' will contain a dialstring to redial the
     device that parked the call.
   - On UnParkedCall events, the 'From' header would instead represent the
     channel responsible for retrieving the parkee. It receives a channel
     snapshot labeled 'Retriever'. The 'from' field is is replaced with
     'RetrieverChannel'.
   - Lastly, the 'Exten' field has been replaced with 'ParkingSpace'.

 - The AMI event 'Parkinglot' (response to 'Parkinglots' command) in a similar
   fashion has changed the field names 'StartExten' and 'StopExten' to
   'StartSpace' and 'StopSpace' respectively.

 - The AMI 'Status' response event to the AMI Status action replaces the
   'BridgedChannel' and 'BridgedUniqueid' headers with the 'BridgeID' header to
   indicate what bridge the channel is currently in.

CDR (Call Detail Records)
 - Significant changes have been made to the behavior of CDRs. The CDR engine
   was effectively rewritten and built on the Stasis message bus. For a full
   definition of CDR behavior in Asterisk 12, please read the specification
   on the Asterisk wiki (wiki.asterisk.org).

 - CDRs will now be created between all participants in a bridge. For each
   pair of channels in a bridge, a CDR is created to represent the path of
   communication between those two endpoints. This lets an end user choose who
   to bill for what during bridge operations with multiple parties.

 - The duration, billsec, start, answer, and end times now reflect the times
   associated with the current CDR for the channel, as opposed to a cumulative
   measurement of all CDRs for that channel.

CEL:
 - The Uniqueid field for a channel is now a stable identifier, and will not
   change due to transfers, parking, etc.

 - CEL has undergone significant rework in Asterisk 12, and is now built on the
   Stasis message bus. Please see the specification for CEL on the Asterisk
   wiki at https://wiki.asterisk.org/wiki/x/4ICLAQ for more detailed
   information. A summary of the affected events is below:
   - BRIDGE_START, BRIDGE_END, BRIDGE_UPDATE, 3WAY_START, 3WAY_END, CONF_ENTER,
     CONF_EXIT, CONF_START, and CONF_END events have all been removed. These
     events have been replaced by BRIDGE_ENTER/BRIDGE_EXIT.
   - BLINDTRANSFER/ATTENDEDTRANSFER events now report the peer as NULL and
     additional information in the extra string field.

Dialplan:
 - All channel and global variable names are evaluated in a case-sensitive
   manner. In previous versions of Asterisk, variables created and evaluated in
   the dialplan were evaluated case-insensitively, but built-in variables and
   variable evaluation done internally within Asterisk was done
   case-sensitively.

 - Asterisk has always had code to ignore dash '-' characters that are not
   part of a character set in the dialplan extensions.  The code now
   consistently ignores these characters when matching dialplan extensions.

 - BRIDGE_FEATURES channel variable is now casesensitive for feature letter
   codes. Uppercase variants apply them to the calling party while lowercase
   variants apply them to the called party.

Features:
 - The features.conf [applicationmap] <FeatureName>  ActivatedBy option is
   no longer honored.  The feature is always activated by the channel that has
   DYNAMIC_FEATURES defined on it when it enters the bridge. Use predial to set
   different values of DYNAMIC_FEATURES on the channels

 - Executing a dynamic feature on the bridge peer in a multi-party bridge will
   execute it on all peers of the activating channel.

 - There is no longer an explicit 'features reload' CLI command. Features can
   still be reloaded using 'module reload features'.

 - It is no longer necessary (or possible) to define the ATXFER_NULL_TECH in
   features.c for atxferdropcall=no to work properly. This option now just
   works.

Parking:
 - Parking has been extracted from the Asterisk core as a loadable module,
   res_parking.

 - Configuration is found in res_parking.conf. It is no longer supported in
   features.conf

 - The arguments for the Park, ParkedCall, and ParkAndAnnounce applications 
   have been modified significantly. See the application documents for 
   specific details.

 - Numerous changes to Parking related applications, AMI and CLI commands and
   internal inter-workings  have been made. Please read the CHANGES file for 
   the detailed list.

Security Events Framework:
 - Security Event timestamps now use ISO 8601 formatted date/time instead of
   the "seconds-microseconds" format that it was using previously.

AGENT:
 - The password option has been disabled, as the AgentLogin application no
   longer provides authentication.

AUDIOHOOK_INHERIT:
 - Due to changes in the Asterisk core, this function is no longer needed to
   preserve a MixMonitor on a channel during transfer operations and dialplan
   execution. It is effectively obsolete.

CDR: (function)
 - The 'amaflags' and 'accountcode' attributes for the CDR function are
   deprecated. Use the CHANNEL function instead to access these attributes.

 - The 'l' option has been removed. When reading a CDR attribute, the most
   recent record is always used. When writing a CDR attribute, all non-finalized
   CDRs are updated.

 - The 'r' option has been removed, for the same reason as the 'l' option.

 - The 's' option has been removed, as LOCKED semantics no longer exist in the
   CDR engine.

res_rtp_asterisk:
 - ICE/STUN/TURN support in res_rtp_asterisk has been made optional. To enable
   them, an Asterisk-specific version of PJSIP needs to be installed.
   Tarballs are available from https://github.com/asterisk/pjproject/tags/.


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