[asterisk-bugs] [Asterisk 0009431]: Modify connection: Response 491 not handled according to RFC3261

[noreply at bugs.digium.com]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=9431 
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Reported By:                alex-911
Assigned To:                
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Project:                    Asterisk
Issue ID:                   9431
Category:                   Channels/chan_sip/Interoperability
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     acknowledged
Asterisk Version:           1.4.2 
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Disclaimer on File?:        No 
Request Review:              
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Date Submitted:             03-30-2007 12:41 CDT
Last Modified:              11-19-2007 12:48 CST
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Summary:                    Modify connection: Response 491 not handled
according to RFC3261
Description: 
when asterisk receives a reINVITE while a reINVITE from it's own is still
in progress, it answers with a 491 which is basically correct. but in the
RFC, there is a UAC behaviour described how a client should retry to modify
a connection. what asterisk is doing here is already providing call release
codes in the 491 and terminating the session with a BYE afterwards.
according to the RFC a timer should be fired at each client (times
depending who owns the call ID) and the modification should be retried.

find the log attached for a session modification from G.711 to T.38

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Relationships       ID      Summary
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related to          0010481 SIP with canreinvite=yes through multip...
related to          0010868 1.4.11 Stable - Polycom phones hang up ...
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 oej - 11-19-07 12:48  
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Since this is T.38, it's another ball game and that's we have the hangup.
If it wasn't T.38, Asterisk would have given up on the re-invite and
continued the call as before without a BYE. 

Issue History 
Date Modified   Username       Field                    Change               
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11-19-07 12:48  oej            Note Added: 0073987                          
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