Summary:ASTERISK-11549: No ringback toward SIP trunk on inbound SLA call (Again)
Reporter:Mike Thomas (mthomasslo)Labels:
Date Opened:2008-04-17 14:24:13Date Closed:2008-12-09 14:57:36.000-0600
Versions:Frequency of
Environment:Attachments:( 0) verbosedebug.txt
Description:When a call is inbound from a SIP trunk, the ousside caller hears silence
while the SLATrunk(xxx) is executing and the SLAStations are ringing.  All
other inbound SIP calls return a ringback to the caller.


I reported the exact symtoms about a year ago on issue # 9719, after some back and forth it was suggested to change progresinband to "yes".  This solved the problem.  I recently converted the system to 1.4.19 and the problem has returned.  No media appears to be flowing toward the caller while the stations are ringing.  Upon answer, everything works fine.  This is true whether the call arrives on a SIP trunk or originates from a local station.  I see in some release notes that MOH can now be substituted in place of ringback, is it possible that ringback in no longer the default?  I can find no documents to explain how this new feature is configured.
Comments:By: Russell Bryant (russell) 2008-04-17 14:27:51

do you still have progressinband set to yes?

By: Mike Thomas (mthomasslo) 2008-04-17 14:34:06

yes,  I'm going to send a dump of a sample call in a moment.

By: Monte (spirited) 2008-08-11 11:41:40

I am having same issue with interop testing. Engineers said that Asterisk is 'sitting in middle' and not sending its own ringback when connecting with certain GW's. Failure to send 183...
any fix on this?

By: Russell Bryant (russell) 2008-12-09 11:09:50.000-0600

I have been able to reproduce the issue.  I will work on a fix now.

By: Digium Subversion (svnbot) 2008-12-09 14:57:35.000-0600

Repository: asterisk
Revision: 162286

U   branches/1.4/apps/app_meetme.c

r162286 | russell | 2008-12-09 14:57:35 -0600 (Tue, 09 Dec 2008) | 9 lines

Fix an issue where callers on an incoming call on an SLA trunk would not hear ringback.

We need to make sure that we don't start writing audio to the trunk channel until we're
actually ready to answer it.  Otherwise, the channel driver will treat it as inband
progress, even though all they are getting is silence.

(closes issue ASTERISK-11549)
Reported by: mthomasslo