[asterisk-bugs] [Asterisk 0018118]: 1.4 Passthru Receives T38 Re-Invite and passes on a non-T38 invite to other peer.

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=18118 
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Reported By:                alexr1
Assigned To:                
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Project:                    Asterisk
Issue ID:                   18118
Category:                   Channels/chan_sip/T.38
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     acknowledged
Asterisk Version:           1.4.37-rc1 
JIRA:                       SWP-2357 
Regression:                 No 
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:             2010-10-12 01:05 CDT
Last Modified:              2010-10-14 20:09 CDT
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Summary:                    1.4 Passthru Receives T38 Re-Invite and passes on a
non-T38 invite to other peer.
Description: 
INCOMING Fax from PSTN. ENSR has full T38 Gateway support.

Analogue fax -> PSTN -> ENSR2.5.4 -> Ast1.4.37 -> Ast1.6.1.20

The problem happens when 1.6 re-invites with a T38 Offer to 1.4. 
1.4 see's the T38 offer (and sends TRYING to 1.6), but re-invites to ENSR
with G711 instead of T38.

Upon close inspection of the Debug log, Asterisk sends TRYING and then
chooses to "DEFER" sending the T38 re-invite to ENSR. What happens after
that, I'm not exactly sure.
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 (0128078) alexr1 (reporter) - 2010-10-14 20:09
 https://issues.asterisk.org/view.php?id=18118#c128078 
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We're getting somewhere. Previously all the caller heard was silence, but
now after a couple of seconds of silence, fax tones come on (Which I
thought meant a successful T.38 handshake)

Again:
Analogue fax -> PSTN -> ENSR2.5.4 -> Ast1.4.37 -> Ast1.6.1.20

This time the fax is actually communicating via T38 but appears to fail
after some time. 

Issue History 
Date Modified    Username       Field                    Change               
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2010-10-14 20:09 alexr1         Note Added: 0128078                          
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