[SIPForum-discussion] doubt in Example-3.7 of RFC 3665

[pankaj jain]

Thanks a lot friends
The doubt is cleared now.

On 3/21/07, Singh, Indresh (SNL US) <indresh.singh at siemens.com> wrote:
>
>  Rob is absolutely right. Both parties maintain there own sequence number
> as described in the dialog section ( 12.1 ) of RFC-3261
>
>
> A dialog contains certain pieces of state needed for further message
>
> transmissions within the dialog. This state consists of the dialog
>
> ID, *a local sequence number (used to order requests from the UA to*
>
> *its peer), a remote sequence number (used to order requests from its*
>
> *peer to the UA),* a local URI, a remote URI, remote target, a boolean
>
> flag called "secure", and a route set, which is an ordered list of
>
> URIs. The route set is the list of servers that need to be traversed
>
> to send a request to the peer. A dialog can also be in the "early"
>
> state, which occurs when it is created with a provisional response,
>
> and then transition to the "confirmed" state when a 2xx final
>
> response arrives. For other responses, or if no response arrives at
>
> all on that dialog, the early dialog terminates.
> Regards,
>
> Indresh K Singh
>
>  ------------------------------
> *From:* discussion-bounces at sipforum.org [mailto:
> discussion-bounces at sipforum.org] *On Behalf Of *Robert Sparks
> *Sent:* Wednesday, March 21, 2007 6:06 AM
> *To:* pankaj jain
> *Cc:* discussion at sipforum.org
> *Subject:* Re: [SIPForum-discussion] doubt in Example-3.7 of RFC 3665
>
> The CSeq sequence is scoped to each endpoint (Alice keeps a monotonically
> increasing sequence and Bob keeps a _separate_ monotonically increasing
> sequence in this dialog).
> RjS
>
>  On Mar 21, 2007, at 10:34 AM, pankaj jain wrote:
>
> Hi,
> I was going through RFC 3665 -- Basic Call Flow Examples: 3.7 - Session
> with re-INVITE (IP Address Change)<http://www.tech-invite.com/SIP/3665/Ti-SIP%203665-3.7%20%28v1.1%29.pdf>
> The CSeq header in 1st INVITE (Alice to Bob) is 1
> The CSeq header in 2nd INVITE (Bob to Alice) is 14
> and The CSeq header in BYE (Alice to Bob) is 2
>
> My questions are:
> Shouldn't CSeq be monotonically increasing in a call?
> is CSeq similar to TCP seq number where both parties maintain their own
> sequence numbers?
>
> --
> Thanks
> Pankaj Jain _______________________________________________
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-- 
Thanks
Pankaj Jain
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