Add documentation to function CHANNEL for options echocan_mode and buffers

The ability to set "echocan_mode" and "buffers" through the dialplan was added
to chan_dahdi some time ago.  This patch adds some documentation to
func_channel.

(Closes issue ASTERISK-19911)
Reported by: Dale Noll
Tested by: Michael L. Young
Patches:
  asterisk-19911-branch18.diff uploaded by Michael L. Young (license 5026)

Review: https://reviewboard.asterisk.org/r/1949/
........

Merged revisions 368092 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 368093 from http://svn.asterisk.org/svn/asterisk/branches/10

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@368094 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/funcs/func_channel.c b/funcs/func_channel.c
index 37b34d7..14ece0c 100644 (file)
--- a/funcs/func_channel.c
+++ b/funcs/func_channel.c
@@ -253,6 +253,26 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
                                                <para>R/O PRI Nonzero if the channel has no B channel.
                                                The channel is either on hold or a call waiting call.</para>
                                        </enum>
+                                       <enum name="buffers">
+                                               <para>W/O Change the channel's buffer policy (for the current call only)</para>
+                                               <para>This option takes two arguments:</para>
+                                               <para>  Number of buffers,</para>
+                                               <para>  Buffer policy being one of:</para>
+                                               <para>      <literal>full</literal></para>
+                                               <para>      <literal>immediate</literal></para>
+                                               <para>      <literal>half</literal></para>
+                                       </enum>
+                                       <enum name="echocan_mode">
+                                               <para>W/O Change the configuration of the active echo
+                                               canceller on the channel (if any), for the current call
+                                               only.</para>
+                                               <para>Possible values are:</para>
+                                               <para>  <literal>on</literal>   Normal mode (the echo canceller is actually reinitalized)</para>
+                                               <para>  <literal>off</literal>  Disabled</para>
+                                               <para>  <literal>fax</literal>  FAX/data mode (NLP disabled if possible, otherwise
+                                                       completely disabled)</para>
+                                               <para>  <literal>voice</literal>        Voice mode (returns from FAX mode, reverting the changes that were made)</para>
+                                       </enum>
                                </enumlist>
                                <para><emphasis>chan_ooh323</emphasis> provides the following additional options:</para>
                                <enumlist>