Hi guys, My FS ignore 200 OK message from one of my carriers. What can be the reson ?I heard about issue with Session-Expires: -1 But.... My 200 OK message hasn't such header. Please advice U 2013/07/18 11:29:21.673774 111.111.111.111:5060 -> 222.222.222.222:5060SIP/2.0 200 OK.Via: SIP/2.0/UDP 222.222.222.222;received=222.222.222.222;rport=5060;branch=z9hG4bKm9vjBFHyHycpc.From: <sip:78125555555@222.222.222.222>;tag=gNX1y2B8vXa1D.To: <sip:12127777777@ingress.dal.shangovoip.com>;tag=sbcsipuas_1_C51361_20130718112919309_b12sb02.Call-ID: a7727999-6a61-1231-ed92-90b11c5878d7.Record-Route: <sip:333.333.333.333;lr;ftag=gNX1y2B8vXa1D>.Record-Route: <sip:444.444.444.444;lr;ftag=gNX1y2B8vXa1D;did=f18.5b69f806>.Record-Route: <sip:555.555.555.555;lr;ftag=gNX1y2B8vXa1D>.Record-Route: <sip:111.111.111.111;lr;ftag=gNX1y2B8vXa1D;did=f18.b4617df.Contact: <sip:777.777.777.777:5060>.CSeq: 46744615 INVITE.Allow: ACK,BYE,CANCEL,INVITE,OPTIONS,NOTIFY,INFO.Server: sbc_5.Content-Type: application/sdp.Content-Length: 236..v=0.o=SBCSIPUAS 900213980 1 IN IP4 888.888.888.888.s=SBCSIPUAS SIP STACK v1.0.c=IN IP4 888.888.888.888.t=0 0.m=audio 21526 RTP/AVP 8 101.a=rtpmap:8 PCMA/8000.a=rtpmap:101 telephone-event/8000.a=fmtp:101 0-15.a=sendrecv.a=maxptime:20. nta.c:3212 agent_recv_response() nta: received 200 OK for INVITE (46747876)nta.c:3239 agent_recv_response() nta: 200 OK has fatal syntax errors