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    • Richard Mudgett's avatar
      chan_pjsip: Add "rpid_immediate" option to prevent unnecessary "180 Ringing" messages. · 4c2fc5b8
      Richard Mudgett authored
      Incoming PJSIP call legs that have not been answered yet send unnecessary
      "180 Ringing" or "183 Progress" messages every time a connected line
      update happens.  If the outgoing channel is also PJSIP then the incoming
      channel will always send a "180 Ringing" or "183 Progress" message when
      the outgoing channel sends the INVITE.
      
      Consequences of these unnecessary messages:
      
      * The caller can start hearing ringback before the far end even gets the
      call.
      
      * Many phones tend to grab the first connected line information and refuse
      to update the display if it changes.  The first information is not likely
      to be correct if the call goes to an endpoint not under the control of the
      first Asterisk box.
      
      When connected line first went into Asterisk in v1.8, chan_sip received an
      undocumented option "rpid_immediate" that defaults to disabled.  When
      enabled, the option immediately passes connected line update information
      to the caller in "180 Ringing" or "183 Progress" messages as described
      above.
      
      * Added "rpid_immediate" option to prevent unnecessary "180 Ringing" or
      "183 Progress" messages.  The default is "no" to disable sending the
      unnecessary messages.
      
      ASTERISK-24781 #close
      Reported by: Richard Mudgett
      
      Review: https://reviewboard.asterisk.org/r/4473/
      ........
      
      Merged revisions 433338 from http://svn.asterisk.org/svn/asterisk/branches/13
      
      
      git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@433339 65c4cc65-6c06-0410-ace0-fbb531ad65f3
      4c2fc5b8
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