Merged revisions 298193 via svnmerge from

Merged revisions 298193 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.4

........
  r298193 | rmudgett | 2010-12-13 10:56:07 -0600 (Mon, 13 Dec 2010) | 19 lines

  Outgoing PRI/BRI calls cannot do DTMF triggered transfers.

  Outgoing PRI/BRI calls cannot do DTMF triggered transfers if a PROCEEDING
  message is not received.  The debug output shows that the DTMF begin event
  is seen, but the DTMF end event is missing.  When the DTMF begin happens,
  the call is muted so we now have one way audio (until a DTMF end event is
  somehow seen).

  * Made set the proceeding flag when the PRI_EVENT_ANSWER event is
  received.

  * Made absorb the DTMF begin and DTMF end events if we are overlap dialing
  and have not seen a PROCEEDING message.

  * Added a debug message when absorbing a DTMF event.

  JIRA SWP-2690
  JIRA ABE-2697
........

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@298194 65c4cc65-6c06-0410-ace0-fbb531ad65f3