see my comments inline ...
Regards
Ranjit
Mascon Communication Technologies
http://www.masconit.com
----- Original Message -----
From: Dvir Oren <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, May 29, 2001 2:27 PM
Subject: [Sip-implementors] CSeq number
When should a CSeq be increased?
every new transaction has a new CSeq number.
If a Client sends a Re-INVITE, which is never received, should the
next method on the same call be with an increased CSeq?
yes. only for ACK and CANCEL CSeq is not incremented.
What happens if the Re-INVITE caused an error? The error might have
been that the message was badly formed, and therefore the server will
not update the cseq state. If the server will now send a new method,
it will be with a lower cseq than the state at the client.
here u means to say that the previous INVITE has not reached the server?
or the client has timed out for receiving the ACK?
I think there is some ambiguity regarding when to increase the cseq
number, and what to do with lower (or much higher) numbered messages.
you increase CSeq for every new transaction or request except for ACK and
CANCEL which use
the CSeq number of the acknowledged reply ( ACK) or cancelled request
(CANCEL). The server must copy the
CSeq value of the request in the corresponding replies.
--
Dvir Oren <[EMAIL PROTECTED]>
Lucid Voice Ltd. <http://www.lucidvoice.com>
5 Jabotinski St., Ramat-Gan, 52520 Israel
Tel: 972 3 5757488 Fax: 972 3 5757499
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