chan_dahdi: Add inband_on_proceeding compatibility option.
authorRichard Mudgett <rmudgett@digium.com>
Wed, 3 Apr 2013 20:20:09 +0000 (20:20 +0000)
committerRichard Mudgett <rmudgett@digium.com>
Wed, 3 Apr 2013 20:20:09 +0000 (20:20 +0000)
commit79818112fdc9190e4dccf632d403d35343785bdf
treef7d0f06ecfe95a74d2b02e615d13625f008d14b2
parent1cafccdf877f623bee5d4eb3c32c7fe4aa605678
chan_dahdi: Add inband_on_proceeding compatibility option.

The new inband_on_proceeding option causes Asterisk to assume inband audio
may be present when a PROCEEDING message is received.

Q.931 Section 5.1.2 says the network cannot assume that the CPE side has
attached to the B channel at this time without explicitly sending the
progress indicator ie informing the CPE side to attach to the B channel
for audio.  However, some non-compliant ISDN switches send a PROCEEDING
without the progress indicator ie indicating inband audio is available and
assume that the CPE device has connected the media path for listening to
ringback and other messages.

ASTERISK-17834 which causes this issue was dealing with a non-compliant
network switch.

(closes issue ASTERISK-21151)
Reported by: Gianluca Merlo
Tested by: rmudgett
........

Merged revisions 384685 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 384689 from http://svn.asterisk.org/svn/asterisk/branches/11

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@384696 65c4cc65-6c06-0410-ace0-fbb531ad65f3
channels/chan_dahdi.c
channels/sig_pri.c
channels/sig_pri.h
configs/chan_dahdi.conf.sample