[asterisk-bugs] [Asterisk 0014448]: [patch] chan_sip fails to remove hold when receving a reINVITE without SDP

[Asterisk Bug Tracker]

The following issue has been SUBMITTED. 
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http://bugs.digium.com/view.php?id=14448 
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Reported By:                frawd
Assigned To:                
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Project:                    Asterisk
Issue ID:                   14448
Category:                   Channels/chan_sip/Interoperability
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
Asterisk Version:           1.4.23 
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:             2009-02-10 04:19 CST
Last Modified:              2009-02-10 04:19 CST
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Summary:                    [patch] chan_sip fails to remove hold when receving
a reINVITE without SDP
Description: 
Another problem connecting Asterisk with a Nortel CS2K, which sends "empty"
reINVITEs when it wants to stop hold.

At some point, the chan_sip code states:
"/* Some devices signal they want to be put off hold by sending a
re-invite
*without* an SDP, which is supposed to mean "Go back to your state"
and since they put os on remote hold, we go back to off hold */"

This patch actually makes it work with 1.4.23.1
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Issue History 
Date Modified    Username       Field                    Change               
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2009-02-10 04:19 frawd          New Issue                                    
2009-02-10 04:19 frawd          Asterisk Version          => 1.4.23          
2009-02-10 04:19 frawd          Regression                => No              
2009-02-10 04:19 frawd          SVN Branch (only for SVN checkouts, not tarball
releases) => N/A             
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