Dear all, In the following call flows which transport layer protocol should be chosen? My guess is that UA1 should send out PRACK message by UDP because the contact header of "180 Ringing" indicates transport=udp (no transport header means use of UDP) 1) UA1 -> UA2 INVITE sip:[EMAIL PROTECTED] SIP/2.0 Via: SIP/2.0/TCP 165.213.198.71:5060;branch=z9hG4bKhsig0000000004AAVXMFtSC1IABgAAAAAAAA From: <sip:[EMAIL PROTECTED]>;tag=97189e6e-0000-7267517 To: <sip:[EMAIL PROTECTED]> Call-ID: <mailto:[EMAIL PROTECTED]> [EMAIL PROTECTED] CSeq: 2 INVITE Contact: <sip:[EMAIL PROTECTED]:5060;transport=tcp> P-Preferred-Identity: <sip:[EMAIL PROTECTED]> Max-Forwards: 70 Allow: INVITE,ACK,BYE,CANCEL,NOTIFY,REFER,OPTIONS,SUBSCRIBE,PRACK,UPDATE,INFO,MESSA GE Supported: 100rel, replaces User-Agent: Samsung-iBG-SIPUA-2.1.3.5 Content-Type: application/sdp Content-Length: 202 2) UA1 <- UA2 SIP/2.0 180 Ringing Via:SIP/2.0/TCP 165.213.198.71:5060;branch=z9hG4bKhsig0000000004AAVXMFtSC1IABgAAAAAAAA From:<sip:[EMAIL PROTECTED]>;tag=97189e6e-0000-7267517 To:<sip:[EMAIL PROTECTED]>;tag=601915135-1200974940640 Call-ID:[EMAIL PROTECTED] CSeq:2 INVITE Allow:ACK,BYE,CANCEL,INFO,INVITE,OPTIONS,PRACK,REFER,NOTIFY Supported: Contact:<sip:as.iop2.broadworks.net> Require:100rel RSeq:265790704 Content-Length:0 3) UA1 -> UA2 PRACK sip:as.iop2.broadworks.net SIP/2.0 Via: SIP/2.0/UDP 165.213.198.71:5060;branch=z9hG4bKhsig0000000005AAnEAFtTC1MABgAAAAAAAA From: <sip:[EMAIL PROTECTED]>;tag=97189e6e-0000-7267517 To: <sip:[EMAIL PROTECTED]>;tag=601915135-1200974940640 Call-ID: <mailto:[EMAIL PROTECTED]> [EMAIL PROTECTED] CSeq: 3 PRACK Max-Forwards: 70 User-Agent: Samsung-iBG-SIPUA-2.1.3.5 RAck: 265790704 2 INVITE Content-Length: 0 My best regards, Jun
___________________________________________ Hyoungjoon Park (Jun Park) Senior Engineer R&D Team Business Management Office Telecommunication Network Business Samsung Electronics Co., LTD. (O) +82-31-279-2343 (F) +82-31-279-5255 (M) +82-16-9530-2343 email : <blocked::blocked::blocked::blocked::blocked::mailto:[EMAIL PROTECTED]> [EMAIL PROTECTED] _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
