[asterisk-bugs] [Asterisk 0017105]: 1.6.1.18 -> 1.6.2.6 T38 Fax: call drops

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=17105 
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Reported By:                seandarcy
Assigned To:                
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Project:                    Asterisk
Issue ID:                   17105
Category:                   Applications/app_fax
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     acknowledged
Asterisk Version:           1.6.2.6 
JIRA:                       SWP-1184 
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:             2010-03-27 16:27 CDT
Last Modified:              2010-05-02 13:42 CDT
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Summary:                    1.6.1.18 -> 1.6.2.6 T38 Fax: call drops
Description: 
Using spandsp-0.0.6-pre17, SendFax on 1.6.1.18 and ReceiveFax on 
1.6.2.8. Sip.conf on both sides has t38pt_udptl = yes.

     -- Executing [s at fax-tx-test:3] SendFAX("SIP/side-sip-00000009", 
"/var/spool/asterisk/fax/20091113_1455.tif") in new stack
[Mar 20 17:05:34] WARNING[6433]: app_fax.c:178 phase_e_handler: Error 
transmitting fax. result=49: The call dropped prematurely.
[Mar 20 17:05:34] WARNING[6433]: app_fax.c:772 transmit: Transmission
failed
     -- Executing [s at fax-tx-test:4] Hangup("SIP/side-sip-00000009", "") 
in new stack
   == Spawn extension (fax-tx-test, s, 4) exited non-zero on 
'SIP/side-sip-00000009'
     -- Executing [h at fax-tx-test:1] NoOp("SIP/side-sip-00000009", 
"FAXSTATUS: FAILED
FAXERROR: The call dropped prematurely
FAXMODE: T38")

On the receive side:

     -- Executing [s at incoming-fax:2] ReceiveFAX("SIP/side-sip-00000002", 
"/var/spool/asterisk/fax/20100320_1705.tif") in new stack
[Mar 20 17:05:34] WARNING[21512]: app_fax.c:223 phase_e_handler: Error 
transmitting fax. result=48: Disconnected after permitted retries.
[Mar 20 17:05:34] WARNING[21512]: app_fax.c:820 transmit: Transmission 
failed
     -- Executing [s at incoming-fax:3] Hangup("SIP/side-sip-00000002", "") 
in new stack

FAXSTATUS: FAILED
FAXERROR: Disconnected after permitted retries
FAXMODE: T38")

Sip audio calls work fine over side-sip.

And if I use the same script to send DAHDI->DAHDI over pstn, it works.

I'm uploading error.sip.fax, a sip debug from the SendFax end.
10.10.10.180 is 1.6.1.18 SendFax, 64.aaa.bbb.ccc is the SendFax public ip.
10.10.11.180 is 1.6.2.6 ReceiveFax and 76.xxx.yyy.zzz is the ReceiveFax
public ip.

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 (0121279) seandarcy (reporter) - 2010-05-02 13:42
 https://issues.asterisk.org/view.php?id=17105#c121279 
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Upgraded to 1.6.2.7-rc3 on both boxes. spandsp-pre17 and 20100501.

Posted to spandsp list:

http://soft-switch.org/pipermail/spandsp/2010-May/000076.html

Hi Sean,

It looks like the two parties are not communicating. Think is a problem 
outside spandsp. You should address it to the Asterisk users mailing
list.

Stve

Tried t38pt_udptl = yes,fec,maxdatagram=200 in both boxes. No joy. I've
attached the DEBUG from the receive side. Setting maxdatagram seems to make
no difference:

[May  2 14:21:20] DEBUG[25914]: chan_sip.c:8940 process_sdp_a_image:
FaxMaxDatagram: 1400
[May  2 14:21:20] DEBUG[25914]: chan_sip.c:8355 process_sdp: Processing
media-level (image) SDP a=T38FaxMaxDatagram:1400... OK.

In the attached DEBUG all messages are from chan_sip.c and app_fax.c. Sure
looks like app_fax just can't make the connection.

I've tried to build the new asterisk fax driver, but it won't build on
1.6.2. The commercial is only for i386, not x86-64. 

Issue History 
Date Modified    Username       Field                    Change               
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2010-05-02 13:42 seandarcy      Note Added: 0121279                          
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