Jan Forcier Posted May 9, 2007 Report Share Posted May 9, 2007 I'm testing T.38 Fax with an SPA 2102, with Snon 2.03 latest build, Linux. Our carrier (for inbound) supports T.38. I've followed the instructions I can find for the SPA2102 but when I attempt T.38 the faxing fails (g711u works but with the usual reliability problems) The T.38 Pass thourgh appears to be working since the INVITE packets in the PBXnSIP log clearly show this is passed to the UA (see below). Do you know the settings which will work with SPA2102 T.38? If you know another ATA that has been verified to work, I'd like to know the settings for this adapter and I can possibly buy one. INVITE packet below-------------------------------------------- INVITE sip:6044844702@159.18.161.101:5060 SIP/2.0 Via: SIP/2.0/UDP 66.119.176.21:5060;branch=z9hG4bK-ad99b3cf8bcd8ade9e941caa73a31e86;rport Route: <sip:6046379679@159.18.161.67;ftag=159.18.161.101+1+400593+54d16769;lr=on> From: <sip:6046379679@sproxy.netfone.ca>;tag=c4a452d288 To: Metrobridge <sip:6044844702@159.18.161.101:5060>;isup-oli=00;tag=159.18.161.101+1+400593+54d16769 Call-ID: FC2ED118@159.18.161.101 CSeq: 6652 INVITE Max-Forwards: 70 Contact: <sip:6046379679@66.119.176.21:5060;transport=udp> Supported: 100rel, replaces, norefersub Allow-Events: refer Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, PRACK, INFO, PUBLISH, NOTIFY, SUBSCRIBE, MESSAGE Accept: application/sdp User-Agent: voipportal-PBX/2.0.3.1708 Content-Type: application/sdp Content-Length: 273 v=0 o=- 428992889 428992891 IN IP4 66.119.176.21 s=- c=IN IP4 66.119.176.21 t=0 0 m=image 51072 udptl t38 a=T38FaxVersion:0 a=T38MaxBitRate:14400 a=T38FaxRateManagement:transferredTCF a=T38FaxMaxBuffer:200 a=T38FaxMaxDatagram:200 a=T38FaxUdpEC:t38UDPRedundancy Quote Link to comment Share on other sites More sharing options...
Vodia PBX Posted May 10, 2007 Report Share Posted May 10, 2007 Is this the first packet that the SPA sends? In T.38 the end point first needs to establish a G711 call and then after the fax tone detection switch to T.38. Quote Link to comment Share on other sites More sharing options...
Daniel Floeckinger Posted May 27, 2007 Report Share Posted May 27, 2007 Hi! I have a very similar problem. Our VOIP Gateway to the outside world supports T38. The problem is, i simply cant get the SPA to work with t38. I made traces which very clearly show that the SPA does not switch to T38. Even when the re-invite is sent from our gateway. It sticks to g711. I will now try a Patton/Inalp ATA and the Grandstream Adapter which seems to work better. I shall keep you posted. Quote Link to comment Share on other sites More sharing options...
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