[asterisk-bugs] [Asterisk 0014385]: Unhold fails if first SDP on OK, particularly Cisco CCM 6

[Asterisk Bug Tracker]

The following issue requires your FEEDBACK. 
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https://issues.asterisk.org/view.php?id=14385 
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Reported By:                davidw
Assigned To:                file
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Project:                    Asterisk
Issue ID:                   14385
Category:                   Channels/chan_sip/Interoperability
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     feedback
Asterisk Version:           1.6.0.1 
Regression:                 No 
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2009-02-02 06:39 CST
Last Modified:              2009-05-21 09:35 CDT
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Summary:                    Unhold fails if first SDP on OK, particularly Cisco
CCM 6
Description: 
Cisco CCM 6 appears never to send SDP on the INVITE, so Asterisk
effectively makes the offer, even when the Cisco is re-inviting because a
CCM hosted phone has gone on hold.  Asterisk sets up its SDP from flags[1]
in the channel private data structure, which means that, if the channel was
on hold, it will offer a=inactive (observed, although a=recvonly also seems
possible).  Even if the CCM intended to unhold, the only possible response
to an a=inactive offer, is a=inactive.  Asterisk should only actually use
saved state if it is making the response.  For an offer, as it looks like
it can never locally hold, it should offer a=sendrecv.
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Relationships       ID      Summary
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related to          0014448 [patch] chan_sip fails to remove hold w...
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 (0105195) file (administrator) - 2009-05-21 09:35
 https://issues.asterisk.org/view.php?id=14385#c105195 
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Have you tried narrowing this down a bit by disabling reinvites? Maybe the
initial reinvite for direct RTP is causing the Cisco some grief to begin
with. At the very least simplifying the scenario even further will help
reduce the signaling interaction. 

Issue History 
Date Modified    Username       Field                    Change               
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2009-05-21 09:35 file           Note Added: 0105195                          
2009-05-21 09:35 file           Status                   assigned => feedback
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