Once the first INVITE has failed, and early dialog it might have had is
gone. The retried INVITE is working toward establishing a new dialog. So
the CSeq values are for that dialog. I think that means the CSeq
numbering should be permitted to restart.
OTOH, if there are any messages still in transit from the prior attempt,
they could be a problem if the numbering resets.
Thanks,
Paul
ViVeK tAlWaR wrote:
> According to RFC 3261
>
>
>
> "CSeq or Command Sequence contains an integer and a method name. The
>
> CSeq number is incremented for each new request within a dialog and
>
> is a traditional sequence number.
>
> "
>
>
>
> CSeq increment is not done for specific request it is done for all the
> request in the dialog.
>
>
>
> Regards,
>
> Vivek
>
> _____
>
> From: [email protected]
> [mailto:[email protected]] On Behalf Of
> Dushyant Dhalia
> Sent: Friday, January 29, 2010 4:52 PM
> To: OKUMURA Shinji
> Cc: [email protected]
> Subject: Re: [Sip-implementors] CSeq of retried INVITE
>
>
>
> It must be greater that or equal to 3.
>
> Dushyant P S Dhalia
>
> OKUMURA Shinji wrote:
>
> 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
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>
>
>
>
>
>
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