[Sip-implementors] SIP message and Cseq incrementation

[Mustafa Ozveren]

Hello All,

Just a question about cseq incrementation.

Is the incrementation of CSEQ must be +1 at each request or incrementation
of type +n ( n > 1 ) is valid ?
Because I am reading in Vocal code that incrementation +n seems to be valid.

Thanks,
Mustafa

[amarendra.samal]

Hi,

The increamentation of the CSeq must be +1 at each request within dialog.
Plz refer to RFC 3261 sec 12.2.1.1

"The Call-ID of the request MUST be set to the Call-ID of the
dialog.
Requests within a dialog MUST contain strictly monotonically
increasing and contiguous CSeq sequence numbers (increasing-by-one)
in each direction (excepting ACK and CANCEL of course, whose numbers
equal the requests being acknowledged or cancelled). Therefore, if
the local sequence number is not empty, the value of the local
sequence number MUST be incremented by one, and this value MUST be
placed into the CSeq header field."

Rgds,
Amar
Mobile: [phone]
The greatest enemy of best is "good." If you're willing to accept "good"
you'll never be the "Best."



Mustafa Ozveren
<mustafa.ozveren@
gmail.com> To
Sent by: sip-implementors at cs.columbia.edu
sip-implementors- cc
bounces at cs.columb
ia.edu Subject
[Sip-implementors] SIP message and
Cseq incrementation
11/02/2005 02:27
PM








Hello All,

Just a question about cseq incrementation.

Is the incrementation of CSEQ must be +1 at each request or incrementation
of type +n ( n > 1 ) is valid ?
Because I am reading in Vocal code that incrementation +n seems to be
valid.

Thanks,
Mustafa
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[Nataraju A B]

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Nataraju A.B.
-----Original Message-----
From: sip-implementors-bounces at cs.columbia.edu
[mailto:sip-implementors-bounces at cs.columbia.edu] On Behalf Of Mustafa
Ozveren
Sent: Wednesday, November 02, 2005 2:27 PM
To: sip-implementors at cs.columbia.edu
Subject: [Sip-implementors] SIP message and Cseq incrementation

Hello All,

Just a question about cseq incrementation.

Is the incrementation of CSEQ must be +1 at each request or
incrementation
of type +n ( n > 1 ) is valid ?
Because I am reading in Vocal code that incrementation +n seems to be
valid.

[ABN] AFAIK it does not violate any part of RFC 3261......

Thanks,
Mustafa

[Nayak, Subhash]

A UAC must always increment the Cseq by 1, but a UAS should be prepared
to receive a request with the Cseq incremented by greater than 1. You're
probably looking at the part of the code that is lenient to handling
such a jump in Cseq at the UAS end.

The above leniency can be deduced from Section 12.2.2 of the RFC.

Subhash Nayak.
Sonus Networks, Inc.
http://www.sonusnet.com

-----Original Message-----
From: sip-implementors-bounces at cs.columbia.edu
[mailto:sip-implementors-bounces at cs.columbia.edu] On Behalf Of Mustafa
Ozveren
Sent: Wednesday, November 02, 2005 2:27 PM
To: sip-implementors at cs.columbia.edu
Subject: [Sip-implementors] SIP message and Cseq incrementation

Hello All,

Just a question about cseq incrementation.

Is the incrementation of CSEQ must be +1 at each request or
incrementation
of type +n ( n > 1 ) is valid ?
Because I am reading in Vocal code that incrementation +n seems to be
valid.

Thanks,
Mustafa

[Mustafa Ozveren]

Thanks for your responses !


Best regards,
Mustafa