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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>WireShark does a good job showing the T38 communication. Most products you can also set packet redundancy to send 2 packets. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] <b>On Behalf Of </b>P Z<br><b>Sent:</b> Thursday, July 29, 2010 7:49 AM<br><b>To:</b> asterisk-users@lists.digium.com<br><b>Subject:</b> [asterisk-users] T.38 fax between ATA's and Asterisk and Cisco PGW 2200<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>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:<br>- Patton M-ATA<br>- Grandstream HandyTone 486<br>- Fritz!Box 7170<br><br>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.<br><br>These Asterisk servers are connected to a Cisco PGW 2200 + AS5400XM.<br><br><br>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.<br><br><br>ATA's -> Asterisk ReceiveFax:<br>So far i have only succeeded in sending fax messages from the Fritz!Box 7170 to both Asterisk configurations using the ReceiveFax application.<br>Sending fax messages from the other ATA's to Asterisk using the ReceiveFax application failed.<br><br><br>ATA's -> PGW:<br>To exclude Asterisk i have connected the ATA's directly to the PGW; no success either.<br><br><br>Asterisk -> PGW:<br>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:<br><br><br>Asterisk 1.6.2.6 compiled with SpanDSP-0.0.6pre17 :<br><br>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.<br>asterisk[1367]: WARNING[18591]: app_fax.c:820 in transmit: Transmission failed<br><br>asterisk[1367]: WARNING[18906]: app_fax.c:223 in phase_e_handler: Error transmitting fax. result=20: Received no response to DCS or TCF.<br>asterisk[1367]: WARNING[18906]: app_fax.c:820 in transmit: Transmission failed<br><br>asterisk[1367]: WARNING[18986]: app_fax.c:223 in phase_e_handler: Error transmitting fax. result=49: The call dropped prematurely.<br>asterisk[1367]: WARNING[18986]: app_fax.c:817 in transmit: Transmission error<br><br><br>Asterisk 1.6.2.6 with Fax for Asterisk :<br><br>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.<br>asterisk[7092]: ERROR[3167]: res_fax.c:1650 in sendfax_exec: error initializing channel 'SIP/out.to.pgw-000b3f49' in T.38 mode<br><br>asterisk[7092]: VERBOSE[3226]: -- FAX handle 0: [ 028.000627 ], entering CLOSING state<br>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: ''<br><br>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.<br>asterisk[7092]: ERROR[3272]: res_fax.c:1650 in sendfax_exec: error initializing channel 'SIP/out.to.pgw-000b3f8b' in T.38 mode<br><br><br>My questions:<br><br>- Does anyone have experience with T.38 fax with a setup like this: ATA -> Asterisk -> PGW -> PSTN?<br><br>- Does anyone have experience in connecting Asterisk to a Cisco PGW 2200 + AS5400XM?<br><br>- Are there any tools to debug T.38 traffic?<br><br>Thanks!<o:p></o:p></span></p></div></body></html>
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