[asterisk-bugs] [Asterisk 0018936]: When transferring a call using the REFER command with replaces enabled, Asterisk drops the call.

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=18936 
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Reported By:                ltc
Assigned To:                
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Project:                    Asterisk
Issue ID:                   18936
Category:                   Channels/chan_sip/Transfers
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     new
Asterisk Version:           SVN 
JIRA:                        
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!): 309808 
Request Review:              
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Date Submitted:             2011-03-07 14:10 CST
Last Modified:              2011-03-08 07:18 CST
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Summary:                    When transferring a call using the REFER command
with replaces enabled, Asterisk drops the call.
Description: 
When transferring a call using the REFER command with replaces enabled,
Asterisk drops the call with "SIP/2.0 481 Call leg/transaction does not
exist". I have tried performing this on 1.4 SVN, 1.8.3, Trunk SVN 309404,
and 1.8 SVN 309808. All have produced the same result. I have attached the
debug logs with core and sip debugging on. Unfortunately I do not have a
way to perform a successful transfer with REFER to compare against. Line
432 is where the REFER starts. Chan_sip.c starts to process the REFER but
then later drops it on line 538 with the "SIP/2.0 481 Call leg/transaction
does not exist". 
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 (0132719) davidw (reporter) - 2011-03-08 07:18
 https://issues.asterisk.org/view.php?id=18936#c132719 
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Asterisk will try and bridge channels together.  It is a back to back user
agent, not a proxy.

As I said, the trace shows a REFER which is trying to replace a call which
is not present in the trace. 

Issue History 
Date Modified    Username       Field                    Change               
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2011-03-08 07:18 davidw         Note Added: 0132719                          
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