Merged revisions 296165 via svnmerge from

Merged revisions 296165 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.4

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  r296165 | rmudgett | 2010-11-24 16:41:07 -0600 (Wed, 24 Nov 2010) | 43 lines

  Oneway audio to SIP phone from FXS port after FXS port gets a CallWaiting pip.

  The FXS connected phone has to have CW/CID support to fail, as it will
  send back a DTMF 'A' or 'D' when it's ready to receive CallerID.  A normal
  phone with no CID never fails.  Also the SIP phone does not hear MOH when
  the CW call is answered.

  The DTMF end frame is suppressed when the phone acknowledges the CW signal
  for CID.  The problem is the DTMF begin frame needs to be suppressed as
  well.  The DTMF begin frame is causing SIP to start sending the DTMF RTP
  frames.  Since the DTMF end frame is suppressed, SIP will not stop sending
  those DTMF RTP packets.

  * Suppress the DTMF begin and end frames when the channel driver is
  looking for DTMF digits.

  * Fixed a couple issues caused by not cleaning up the CID spill if you
  answer the CW call while it is sending the CID spill.

  * Fixed not sending CW/CID spill to the phone when the call is natively
  bridged.  (Fixed by not using native bridge if CW/CID is possible.)

  * Suppress received audio when sending CW/CID spills.  The other parties
  involved do not need to hear the CW/CID spills and may be confused if the
  CW call is for them.

  (closes issue #18129)
  Reported by: alecdavis
  Patches:
        issue_18129_v1.8_v3.patch uploaded by rmudgett (license 664)
  Tested by: alecdavis, rmudgett

  NOTE:

  * v1.4 does not have the main problem fixed by suppressing the DTMF start
  frames.  The other three items fixed are relevant.

  * If you really must restore native bridging between analog ports, you
  need to disable CW/CID either by configuring chan_dahdi.conf
  callwaitingcallerid=no or dialing *70 before dialing the number to
  temporarily disable CW.
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@296166 65c4cc65-6c06-0410-ace0-fbb531ad65f3