[asterisk-bugs] [Asterisk 0011066]: Asterisk SIP Connections to systems that support t38 fax detection may fail

[noreply at bugs.digium.com]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=11066 
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Reported By:                jon
Assigned To:                file
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Project:                    Asterisk
Issue ID:                   11066
Category:                   Channels/chan_sip/T.38
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     assigned
Asterisk Version:            1.4.12  
SVN Branch (only for SVN checkouts, not tarball releases): N/A  
SVN Revision (number only!):  
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             10-23-2007 14:06 CDT
Last Modified:              02-14-2008 13:02 CST
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Summary:                    Asterisk SIP Connections to systems that support t38
fax detection may fail
Description: 
I've got a list of about 5 Direct Voice or IVR numbers right now that we
can not call using asterisk SIP. 

Using SIP, the following errors are logged (full debug attached in
sip-debug.txt):

[Oct 22 14:49:14] WARNING[6327]: chan_sip.c:5017 process_sdp: Unsupported
SDP me
dia type in offer: image 19596 udptl t38
    -- SIP/bandwidth-08444138 is making progress passing it to
SIP/jon-b5e00468
[Oct 22 14:49:24] WARNING[6327]: chan_sip.c:5017 process_sdp: Unsupported
SDP me
dia type in offer: image 19596 udptl t38
    -- SIP/bandwidth-08444138 answered SIP/jon-b5e00468
  == Spawn extension (local, dial-12128482036, 6) exited non-zero on
'SIP/ingramoffice2-b5e00468'
[Oct 22 14:49:26] WARNING[6327]: chan_sip.c:12528 handle_response: Remote
host can't match request BYE to call
'4944de5b1fc061d90823411753ee8fc4 at 4.68.250.148'. Giving up.


Calling with IAX2 and ZAP works fine, the numbers ring and the IVR or user
answers.
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Relationships       ID      Summary
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related to          0008078 T38 relay doesn't work between Audiocod...
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 file - 02-14-08 13:02  
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oej: The thing for this scenario though is that a reinvite is not involved,
they are sending T38 back in the 200 OK to the original INVITE... how can
we handle that? 

Issue History 
Date Modified   Username       Field                    Change               
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02-14-08 13:02  file           Note Added: 0082258                          
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