Hi Puneet, Below is the SDP for Fax Re-invite from Vendor (UAS) after audio call established with initial offer.
*T.38 RE INVITE SDP* v=0 o=HuaweiSoftX3000 32970986 32970988 IN IP4 1.1.1.1 s=Sip Call c=IN IP4 1.1.1.1 t=0 0 m=image 41046 udptl t38 a=T38FaxVersion:0 a=T38MaxBitRate:14400 a=T38FaxRateManagement:transferredTCF a=T38FaxUdpEC:t38UDPRedundancy m=audio 41128 RTP/AVP 8 0 101 a=rtpmap:8 PCMA/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:101 telephone-event/8000 a=ptime:20 a=silenceSupp:off - - - - a=ecan:fb on - a=fax a=fmtp:101 0-15 *200 OK SDP for T.38 Re invite* v=0 o=Sonus_UAC 10922 10626 IN IP4 1.1.1.1 s=- c=IN IP4 1.1.1.1 t=0 0 m=image 6334 udptl t38 a=T38FaxVersion:0 a=T38MaxBitRate:14400 a=T38FaxRateManagement:transferredTCF a=T38FaxMaxBuffer:262 a=T38FaxMaxDatagram:90 a=sendrecv m=audio 0 RTP/AVP 8 0 101 a=rtpmap:8 PCMA/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:101 telephone-event/8000 a=sendrecv a=ptime:20 a=silenceSupp:off - - - - *This is the Re-invite SDP after T38 Invite* v=0 o=HuaweiSoftX3000 32970986 32970989 IN IP4 1.1.1.1 s=Sip Call c=IN IP4 1.1.1.1 t=0 0 m=audio 41046 RTP/AVP 18 101 a=rtpmap:18 G729/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=fmtp:18 annexb=no Regards, Nitin Kapoor On Fri, Jul 31, 2015 at 2:48 AM, Kumar, Puneet (Puneet) <pune...@avaya.com> wrote: > Hi Nitin, > > For reINVITE for fax, is far-end converting "m=audio" line to "m=image" ? > > Can you share the SDP in both reINVITE's. > > Thanks, > Puneet > > -----Original Message----- > From: sip-implementors-boun...@lists.cs.columbia.edu [mailto: > sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of NK > Sent: Friday, July 31, 2015 11:32 AM > To: sip-implementors@lists.cs.columbia.edu > Subject: [Sip-implementors] SIP Reinvite after T38 Negotitaion > > Dear All, > > It is legal to send re-invite after sending T.38 when negotiation is > already done. > > Below is the scenario. > > UA ---------> INVITE > UA <------100 Trying > UA <------- 180 w/SDP > UA <------- 200 OK > UA ----------> (Re-invite for fax with T.38) UA <------100 Trying UA > <-----------200 OK *UA <---------- RE-INVITE wSDP G.729* *UA ---------> 488* > > Now after this another re-invite is coming (in green) with G.729 Codec and > i am rejecting this with SIP 488. > > Anyone observed this kind of scenario earlier? > > Can you please advise and help on this. > > Thank you in advance. > > Regards > Nitin Kapoor > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > > https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.cs.columbia.edu_mailman_listinfo_sip-2Dimplementors&d=AwICAg&c=BFpWQw8bsuKpl1SgiZH64Q&r=MpUJwczUGVfrfzzrKZS6B5RFgsQraA_BMVc2YztX3Gk&m=A4aV5E2mvyj-yPDeUyK6vrfY6BujtRe4gwymOROxduM&s=AgL6vuPFPgil3UGHFMxI_him1MuOJE24FIyl4ekmey0&e= > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
