[asterisk-bugs] [Asterisk 0013045]: No voice joining snom 190 through asterisk to cisco voice gateway occationally.

[noreply at bugs.digium.com]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=13045 
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Reported By:                kactus
Assigned To:                
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Project:                    Asterisk
Issue ID:                   13045
Category:                   Channels/chan_sip/CodecHandling
Reproducibility:            sometimes
Severity:                   minor
Priority:                   normal
Status:                     new
Asterisk Version:           1.4.17 
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             07-10-2008 03:48 CDT
Last Modified:              07-11-2008 00:32 CDT
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Summary:                    No voice joining snom 190 through asterisk to cisco
voice gateway occationally.
Description: 
Hello

I have a asterisk 1.4.17 box which I have configured to troubleshoot case
12708 and while it resolves that issue, I have come across a concerning bug
that has now occured 3 times in 1.5 days of testing. 

I have a snom 190 talking to asterisk via sip, talking to a cisco voice
gateway via sip. Everything is in realtime talking via odbc and freetds to
a mssql db. 

Calling out works fine most of the time however occationally (3 times)
when I call, the call connects, but no voice traverses in either
direction.

I will attach two sip debugs as I was able to catch it in action, but
please note that rtp debug and rtcp debug was not turned on until part way
through on the broken one. 

Things I noticed: when the first "invite sip" occurs on the broken one, it
does not pass media  or media atributes. Later on it adds ilbc to the
supported codecs and sets mode to 30ms.
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---------------------------------------------------------------------- 
 kactus - 07-11-08 00:32  
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Hi File,

Is that something the Snom is doing wrong or is that an issue with
asterisk? I recall reading something about not sending SDP in the invite
and requesting it later on with options was a valid implementation under
the RFC but I can't find that link atm.

Would removing the incompatible options (in this case ILBC which the snom
does not support) from the allow list in the SIP configuration alleviate
this or we will have issues occationally regardless of what we do when the
phones invite without SDP?

If this is just limited to the old snoms it won't be as much of an issue
for us, the 190 is just my test phone atm. We primarily use linksys 9xx,
with some snom 3xx. We have had too many nat issues with the cisco 7xxx
phones to use anywhere other than on local networks. 

Is this something I should worry about using as a production system? 

Issue History 
Date Modified   Username       Field                    Change               
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07-11-08 00:32  kactus         Note Added: 0090068                          
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