[asterisk-bugs] [Asterisk 0015586]: [patch] Failure to negotiate T.38

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=15586 
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Reported By:                globalnetinc
Assigned To:                kpfleming
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Project:                    Asterisk
Issue ID:                   15586
Category:                   Channels/chan_sip/T.38
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     assigned
Asterisk Version:           SVN 
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:             2009-07-26 15:57 CDT
Last Modified:              2009-09-02 11:13 CDT
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Summary:                    [patch] Failure to negotiate T.38
Description: 
To implement T.38 on most ATAs their is a reinvite required.  In the
process of gatewaying the T.38 negotiations the Asterisk server is not
doing this correctly.  On versions past 1.6.0.10 it does not even send the
same ports on the RTP streams to both parties.  

Every version past 1.6.0.10 fails
1.6.0.11
1.6.1.0
1.6.1.1
1.6.2.0-rc

This also includes the new T.38 stack that is is being introduced. in the
SVN tree of 1.6.1.1 and 1.6.2.0
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 (0110044) globalnetinc (reporter) - 2009-09-02 11:13
 https://issues.asterisk.org/view.php?id=15586#c110044 
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I still see this error when talking to certain devices.  I have attached a
pcap file called faxbufferissue that shows the packets sent.

216.166.168.6 is asterisk
216.166.168.183 is an ATA
216.166.168.17 is a fax server 

[Sep  2 10:07:52] WARNING[25127]: udptl.c:1033 ast_udptl_write: UDPTL
asked to send 53 bytes of IFP when far end only prepared to accept 48
bytes; data loss may occur.
[Sep  2 10:07:52] ERROR[25127]: udptl.c:299 encode_open_type: Buffer
overflow detected (53 + 167 > 200) 

Issue History 
Date Modified    Username       Field                    Change               
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2009-09-02 11:13 globalnetinc   Note Added: 0110044                          
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