CSeq would anyways need to be incremented since previous request has been responded and this is supposed to be a new request as against the retransmission of previous request. Another case would be sending 2nd INVITE with a different Call-ID.
Regards Rohit Aggarwal -----Original Message----- From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of OKUMURA Shinji Sent: Friday, January 29, 2010 4:01 PM To: sip-implementors@lists.cs.columbia.edu Subject: [Sip-implementors] CSeq of retried INVITE Hi, I have a question regarding CSeq of retried INVITE. Consider the following scenario. | INVITE(CSeq:1) | |--------------------------->| | | | 18x | |<---------------------------| | | | PRACK(CSeq:2) | |--------------------------->| | | | 200 OK(PRACK) | |<---------------------------| | | | 415 | |<---------------------------| | | | ACK | |--------------------------->| | | | INVITE(CSeq:2) | |--------------------------->| | with the same Call-ID | | | according to the section 8.1.3.5 in RFC3261, 2nd INVITE "SHOULD have the same value of the Call-ID, To, and From of the previous request, but the CSeq should contain a new sequence number that is one higher than the previous." therefore, I think the CSeq of 2nd INVITE SHOULD be "2". Is my understanding correct? Regards, Shinji _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors ________________________________ "DISCLAIMER: This message is proprietary to Aricent and is intended solely for the use of the individual to whom it is addressed. It may contain privileged or confidential information and should not be circulated or used for any purpose other than for what it is intended. If you have received this message in error, please notify the originator immediately. If you are not the intended recipient, you are notified that you are strictly prohibited from using, copying, altering, or disclosing the contents of this message. Aricent accepts no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus." _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
