Summary:ASTERISK-15394: [regression] Asterisk says "No compatible codecs, not accepting this offer!" on T.38 offer
Reporter:schogge (schogge)Labels:
Date Opened:2010-01-04 10:39:10.000-0600Date Closed:2011-06-07 14:07:21
Versions:Frequency of
Environment:Attachments:( 0) sip_debug.txt
Description:Hi community,

first of all: this is the first bug report in my life.

Since I updated asterisk from 1.4.25 to 1.4.28 I get the the following message when I try to send or receive a fax with T.38 through asterisk:

"NOTICE[11689]: chan_sip.c:5621 process_sdp: No compatible codecs, not accepting this offer!"

This is my setup for receiving faxes:
Provider with T.38 support ---SIP---> Asterisk with T.38 pass through ---SIP---> Callweaver with T.38 support

This is my setup for sending faxes:
Linksys SPA 2102 with T.38 support ---SIP---> Asterisk with T.38 pass through ---SIP---> Provider with T.38 support

With asterisk version 1.4.25 I never saw this message.

Seems like this issue already existed in the past. See https://issues.asterisk.org/view.php?id=12414

Please let me know if there is any further information needed.

Comments:By: Leif Madsen (lmadsen) 2010-01-04 10:47:00.000-0600

Per the bug guidelines, any SIP issues need to provide at least the following documentation:

* SIP debug
* Console output
* SIP history

These can be enabled via the sip.conf file, and the 'core set verbose 10' option on your console while you reproduce the issue.

By: schogge (schogge) 2010-01-04 11:51:51.000-0600


I have uploaded the sip debug. Hope that helps.

My setup for receiving faxes was not complete. Here is the correct overview:
Provider with T.38 support ---SIP (TCP)---> OpenSIPS ---SIP (UDP)---> Asterisk with T.38 pass through ---SIP (UDP)---> Callweaver with T.38 support

OpenSIP Server is sitting between provider and Asterisk to translate TCP to UPD.

By: Leif Madsen (lmadsen) 2010-01-04 14:26:27.000-0600

Thanks for the follow up. I'm setting this to acknowledged and a developer may require additional information. Thanks!

By: Matthew Nicholson (mnicholson) 2010-01-08 15:14:03.000-0600

Please test this with the latest 1.4 SVN branch and if you can sill reproduce the issue, upload a new sip debug.

By: schogge (schogge) 2010-01-13 07:52:40.000-0600

As my provider stopped T.38 support at the moment I have no chance to test. They say they will support T.38 in the futur. As soon as this happens I will test again.


By: Leif Madsen (lmadsen) 2010-01-13 09:04:44.000-0600

Suspending this issue for now as the reporter is unable to move this issue forward. Please open a new issue in the future if you're able to reproduce.