[asterisk-bugs] [Asterisk 0015784]: Simultaneous calls from same Call-ID silently ignored by asterisk

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=15784 
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Reported By:                m0bius
Assigned To:                
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Project:                    Asterisk
Issue ID:                   15784
Category:                   Channels/chan_sip/General
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     acknowledged
Asterisk Version:           SVN 
JIRA:                       SWP-221 
Regression:                 Yes 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2009-08-27 05:40 CDT
Last Modified:              2009-10-23 12:06 CDT
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Summary:                    Simultaneous calls from same Call-ID silently
ignored by asterisk
Description: 
Hello everyone,

We have a follow-me system which terminates calls to an Asterisk server
which holds registrations for our VoIP users. In our follow-me system we
give the capability to the users to perform simultaneous follow-me to the
Asterisk Server (thus ringing two different voip accounts).

However I've noticed that on asterisk 1.6.1.1 and 1.6.1.4 when two calls
are sent simultaneously to different dialled numbers with the same Call-ID,
the second call does not enter the context. In a trace I did, I've seen
that asterisk responds to the SIP INVITE with Trying; however, that calls
stays there until it times out from the remote peer. 

The same thing has been tested on Asterisk 1.6.0.7 and 1.6.0.13 and it
works properly. I will attaching two traces (one from asterisk 1.6.0.7 and
one from asterisk 1.6.1.4)
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Relationships       ID      Summary
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related to          0016116 [patch] Fix/improve transaction/dialog-...
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 (0112671) klaus3000 (reporter) - 2009-10-23 12:06
 https://issues.asterisk.org/view.php?id=15784#c112671 
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I wonder how do you think the caller should handle this. In the scenario I
sketched, if both branches will be accepted and Answered(), the caller will
have 2 dialogs established. Thus, the caller will received 2 RTP streams
and has to send 2 RTP streams. Shall the caller just mix the streams?

I think the problem is just the "ignoring" - because this will cause lots
of retransmissions and weird signaling between the proxy and Asterisk. 

Issue History 
Date Modified    Username       Field                    Change               
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2009-10-23 12:06 klaus3000      Note Added: 0112671                          
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