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 [...@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 [...@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 [...@fax-tx-test:1] NoOp("SIP/side-sip-00000009", 
"FAXSTATUS: FAILED
FAXERROR: The call dropped prematurely
FAXMODE: T38")

On the receive side:

     -- Executing [...@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 [...@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.

Any suggestions welcome.

sean


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