Hi everyone,<br>I have been trying to get T.38 Faxing to work with Iristel sip trunks for last few days but havn't been sccussful. I am using Asterisk 1.6.2.8 and SpanDSP 0.6. Here is what I see in the tcpdump capture:<br>
1. Call come in from the trunk as regular voice call with g.711 codec<br>2. Asterisk answers the call and recognizes the CNG and sends the call to fax extension<br>3. Eventually Receive fax is called with a file name<br>
4. Asterisk sends update message to remote gateway with T38 codec information<br>5. Remote server doesn't respond. Asterisk resends update messages multiple times.<br>6. Eventually remote gateway sends the invite with T38 codecs listed in the SDP <br>
7. Asterisk Responds back with 488 "Not acceptable here"<br>8. Another invite is send from the remote gateway with T38 codecs in the SDP<br>9. Asterisk sends OK but g.711 codecs listed in SDP.<br>10. remote gateway sends the BYE message and call is completed.<br>
<br>The questions I have are:<br>Why Asterisk sends update message in step 4 above instead of send an invite?<br>Why Asterisk responds back with 488 in step 7 above?<br>Why asterisk sends g.711 codecs in step 9 above?<br>
<br>Thanks<br><br>Karim <br><br>