WireShark does a good job showing the T38 communication. Most products you can
also set packet redundancy to send 2 packets.
Your setup was T.38 ATA to T.38 Gateway with PRI/ANALOG/PSTN/G.711. I've heard
various problems with SIP/PSTN and faxing, around jitter/packet loss and it's
not supported by Verizon SIP and others.
From: asterisk-users-boun...@lists.digium.com
[mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of P Z
Sent: Thursday, July 29, 2010 7:49 AM
To: asterisk-users@lists.digium.com
Subject: [asterisk-users] T.38 fax between ATA's and Asterisk and Cisco PGW 2200
To provide a reliable fax solution for users connected to a Asterisk 1.6.2.6
server i have tested a few T.38 capable ATA's:
- Patton M-ATA
- Grandstream HandyTone 486
- Fritz!Box 7170
I have tried Asterisk 1.6.2.6 compiled with SpanDSP-0.0.6pre17 and also
Asterisk 1.6.2.6 with Fax for Asterisk installed.
These Asterisk servers are connected to a Cisco PGW 2200 + AS5400XM.
Sending fax messages from all ATA's to the PSTN (so ATA -> Asterisk -> PGW ->
PSTN) failed with a variety of error messages so i tested the different steps
one by one.
ATA's -> Asterisk ReceiveFax:
So far i have only succeeded in sending fax messages from the Fritz!Box 7170 to
both Asterisk configurations using the ReceiveFax application.
Sending fax messages from the other ATA's to Asterisk using the ReceiveFax
application failed.
ATA's -> PGW:
To exclude Asterisk i have connected the ATA's directly to the PGW; no success
either.
Asterisk -> PGW:
To exclude the ATA's i used the Asterisk SendFax application to send a TIFF
file to a landline each time with a different fax machine connected to it.
Results:
Asterisk 1.6.2.6 compiled with SpanDSP-0.0.6pre17 :
asterisk[1367]: WARNING[18591]: app_fax.c:223 in phase_e_handler: Error
transmitting fax. result=19: Received other than DIS while waiting for DIS.
asterisk[1367]: WARNING[18591]: app_fax.c:820 in transmit: Transmission failed
asterisk[1367]: WARNING[18906]: app_fax.c:223 in phase_e_handler: Error
transmitting fax. result=20: Received no response to DCS or TCF.
asterisk[1367]: WARNING[18906]: app_fax.c:820 in transmit: Transmission failed
asterisk[1367]: WARNING[18986]: app_fax.c:223 in phase_e_handler: Error
transmitting fax. result=49: The call dropped prematurely.
asterisk[1367]: WARNING[18986]: app_fax.c:817 in transmit: Transmission error
Asterisk 1.6.2.6 with Fax for Asterisk :
asterisk[7092]: WARNING[3167]: res_fax.c:1529 in sendfax_t38_init: Audio FAX
not allowed on channel 'SIP/out.to.pgw-000b3f49' and T.38 negotiation failed;
aborting.
asterisk[7092]: ERROR[3167]: res_fax.c:1650 in sendfax_exec: error initializing
channel 'SIP/out.to.pgw-000b3f49' in T.38 mode
asterisk[7092]: VERBOSE[3226]: -- FAX handle 0: [ 028.000627 ], entering
CLOSING state
asterisk[7092]: VERBOSE[3225]: -- Channel 'SIP/out.to.pgw-000b3f72' FAX
session '11' is complete, result: 'FAILED' (FAX_FAILURE_TRAINING), error:
'3RD_FRM_CHECK_ERROR', pages: 0, resolution: 'unknown', transfer rate: '2400',
remoteSID: ''
asterisk[7092]: WARNING[3272]: res_fax.c:1529 in sendfax_t38_init: Audio FAX
not allowed on channel 'SIP/out.to.pgw-000b3f8b' and T.38 negotiation failed;
aborting.
asterisk[7092]: ERROR[3272]: res_fax.c:1650 in sendfax_exec: error initializing
channel 'SIP/out.to.pgw-000b3f8b' in T.38 mode
My questions:
- Does anyone have experience with T.38 fax with a setup like this: ATA ->
Asterisk -> PGW -> PSTN?
- Does anyone have experience in connecting Asterisk to a Cisco PGW 2200 +
AS5400XM?
- Are there any tools to debug T.38 traffic?
Thanks!
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