Hello, I'm having difficulties to make Asterisk (1.6.0.6) interoperate correctly with a CISCO mediaGW in order to send faxes to the PSTN using T.38.
When Asterisk sends the initial INVITE containing the T.38 media offer in the SDP, the CISCO answers with a 488 Not Acceptable Media. Apparently, it looks like a configuration problem in the CISCO, but I have tested the CISCO with the Zoiper client and it successfully sends faxes. The only difference I have noticed between the Asterisk and Zoiper is that whereas the Asterisk sends the T.38 SDP information in the initial INVITE, Zoiper establishes a voice call first and then re-negotiates(with a re-INVITE) the session in order to send the T.38 media. Is it possible to make Asterisk work like this? or is this a problem in the configuration of the CISCO? Any ideas? Thanks in advance. Regards, Santi **The call-file I'm using is: Channel: SIP/080999999...@outbound-calls MaxRetries: 3 WaitTime: 30 Set: LOCALSTATIONID=22222 Set: LOCALHEADERINFO=T38 fax Set: T38CALL=1 Set: T38TXDETECT=yes CallerID: 22222 Context: fax-out Extension: 22222 priority:1 My sip.conf file is: sip.conf [general] bindport=5060 ; UDP Port to bind to (SIP standard port is 5060) bindaddr=192.168.222.160 ; IP address to bind to (0.0.0.0 binds to all) domain=192.168.222.160 ; Add IP address as local domain t38pt_udptl=yes [outbound-calls] type=friend context=openser allow=all ;dtmfmode=info host=10.100.222.201 insecure=very canreinvite=no pedantic=no call-limit=10 The extensions.conf file [fax-out] exten =>s,1,Set(FAXFILE=/root/santi/fax/prueba.tif) exten =>s,n,SipDTMFMode(inband) exten =>s,n,SendFax(${FAXFILE}) exten =>s,n,Hangup The SIP trace is: INVITE sip:0809999...@10.100.222.201 <sip%3a0809999...@10.100.222.201>SIP/2.0 Via: SIP/2.0/UDP 192.168.222.160:5060;branch=z9hG4bK306b777c;rport Max-Forwards: 70 From: "22222" <sip:22...@192.168.222.160 <sip%3a22...@192.168.222.160> >;tag=as43e12927 To: <sip:0809999...@10.100.222.201 <sip%3a0809999...@10.100.222.201>> Contact: <sip:22...@192.168.222.160 <sip%3a22...@192.168.222.160>> Call-ID: 4f9fb8387458a3c6205e2c4467e48...@192.168.222.160 CSeq: 102 INVITE User-Agent: Asterisk PBX 1.6.0.6 Date: Tue, 10 Mar 2009 11:29:44 GMT Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Supported: replaces, timer Content-Type: application/sdp Content-Length: 290 v=0 o=root 525135648 525135648 IN IP4 192.168.222.160 s=Asterisk PBX 1.6.0.6 c=IN IP4 192.168.222.160 t=0 0 m=image 4222 udptl t38 a=T38FaxVersion:0 a=T38MaxBitRate:9600 a=T38FaxRateManagement:transferredTCF a=T38FaxMaxBuffer:400 a=T38FaxMaxDatagram:400 a=T38FaxUdpEC:t38UDPFEC # U +0.015757 10.100.222.201:5060 -> 192.168.222.160:5060 SIP/2.0 488 Not Acceptable Media Reason: Q.850;cause=65 Date: Tue, 10 Mar 2009 11:29:18 GMT From: "22222" <sip:22...@192.168.222.160 <sip%3a22...@192.168.222.160> >;tag=as43e12927 Allow-Events: telephone-event Content-Length: 0 To: <sip:0809999...@10.100.222.201 <sip%3a0809999...@10.100.222.201> >;tag=417D2718-582 Call-ID: 4f9fb8387458a3c6205e2c4467e48...@192.168.222.160 Via: SIP/2.0/UDP 192.168.222.160:5060;branch=z9hG4bK306b777c;rport Server: Cisco-SIPGateway/IOS-12.x CSeq: 102 INVITE # U +0.000164 192.168.222.160:5060 -> 10.100.222.201:5060 ACK sip:0809999...@10.100.222.201 <sip%3a0809999...@10.100.222.201> SIP/2.0 Via: SIP/2.0/UDP 192.168.222.160:5060;branch=z9hG4bK306b777c;rport Max-Forwards: 70 From: "22222" <sip:22...@192.168.222.160 <sip%3a22...@192.168.222.160> >;tag=as43e12927 To: <sip:0809999...@10.100.222.201 <sip%3a0809999...@10.100.222.201> >;tag=417D2718-582 Contact: <sip:22...@192.168.222.160 <sip%3a22...@192.168.222.160>> Call-ID: 4f9fb8387458a3c6205e2c4467e48...@192.168.222.160 CSeq: 102 ACK User-Agent: Asterisk PBX 1.6.0.6 Content-Length: 0
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