[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:              2010-06-02 15:04 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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 (0122841) areversat (reporter) - 2010-06-02 15:04
 https://issues.asterisk.org/view.php?id=17105#c122841 
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Ok after having a look at sip-fax-error.20100501 it seems that the error
message is actually legitimate since it tries phase B several times (phase
B is where the negotiating of things like tranmission rate, etc takes
place) and it fails, so it it gives up :

[May  2 14:21:40] DEBUG[27971]: app_fax.c:175 span_message: FLOW T.30 T4
expired in phase T30_PHASE_B_RX, state 17
[May  2 14:21:40] DEBUG[27971]: app_fax.c:175 span_message: FLOW T.30 Too
many retries. Giving up.

I don't know if it is a problem with the configuration of the fax machine
or something else but it doesn't seem to be a bug in asterisk per say. 

Issue History 
Date Modified    Username       Field                    Change               
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2010-06-02 15:04 areversat      Note Added: 0122841                          
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