[asterisk-bugs] [Asterisk 0010274]: T.38 passthrough with 2 Asterisk boxes not working

[noreply at bugs.digium.com]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=10274 
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Reported By:                cstadlmann
Assigned To:                
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Project:                    Asterisk
Issue ID:                   10274
Category:                   Channels/chan_sip/T.38
Reproducibility:            always
Severity:                   block
Priority:                   normal
Status:                     new
Asterisk Version:            SVN 
SVN Branch (only for SVN checkouts, not tarball releases):  1.4  
SVN Revision (number only!): 76410 
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             07-23-2007 08:41 CDT
Last Modified:              07-31-2007 01:49 CDT
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Summary:                    T.38 passthrough with 2 Asterisk boxes not working
Description: 
This is the configuration I'm using:

ATA 1 <-> Asterisk 1 <-> Asterisk 2 <-> ATA 2

As long ATA's are resided on the same Asterisk box, no T.38 problem. But
if ATA 1 is trying to send a fax via T.38 to ATA 2, the complete call fails
because Asterisk 1 is killing it during re-invite and Asterisk 2 gives up.

Both Asterisk boxes are: SVN-branch-1.4-r76410
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Relationships       ID      Summary
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has duplicate       0010317 Bug 10274 seems to be SIP related, not ...
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---------------------------------------------------------------------- 
 cstadlmann - 07-31-07 01:49  
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I just patched both Asterisk boxes and T.38 it's working like a breeze.
Thanks a lot!

This patch should make it into branch as soon as possible so I don't have
to patch every time I update my boxes.

Although T.38 is working now, we also have to bother about the 491
response. In some cases when the 100 response doesn't arrive at Asterisk2,
Asterisk1 should respond with a 491 so Asterisk2 doesn't retransmit again
and again. If it's specified in RFC3261, I don't see the point why Asterisk
shouldn't do it.

Again, thanks a lot for the patch and please don't forget to update branch
version. 

Issue History 
Date Modified   Username       Field                    Change               
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07-31-07 01:49  cstadlmann     Note Added: 0068102                          
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