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chan_dahdi: Add inband_on_proceeding compatibility option.

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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
This commit is contained in:
Richard Mudgett
2013-04-03 20:20:09 +00:00
parent 1cafccdf87
commit 79818112fd
4 changed files with 21 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
configs/chan_dahdi.conf.sample
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@@ -196,6 +196,18 @@ context=public
;
;resetinterval = 3600
;
; 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.
; Default yes in current release branches for backward compatibility.
;
;inband_on_proceeding=yes
;
; Overlap dialing mode (sending overlap digits)
; Cannot be changed on a reload.
;