We have used a value of 100 to bump up the CSEQ when we switch over to a
backup unit. This is essentially like a reboot.
We do verify the CSEQ is increasing but contiguity is not checked for. We
have no issue with ordering.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] On Behalf Of Jonathan
Rosenberg
Sent: Tuesday, March 06, 2001 4:04 PM
To: 'James Undery'; Jonathan Rosenberg
Cc: Scott Happell; 'Venkatesh Venkataramanan';
[EMAIL PROTECTED]
Subject: RE: [Sip-implementors] RE: [SIP] Question regarding CSEQ processing
with PRACK...
Importance: High
> -----Original Message-----
> From: James Undery [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, February 27, 2001 4:34 AM
> To: Jonathan Rosenberg
> Cc: Scott Happell; 'Venkatesh Venkataramanan';
> [EMAIL PROTECTED]
> Subject: Re: [Sip-implementors] RE: [SIP] Question regarding CSEQ
> processing with PRACK...
>
>
>
>
> Jonathan Rosenberg wrote:
>
> > Scott is correct. The next CSeq is 4.
>
> Or (obviously) any other number greater than four, the requirement is
> strictly increasing monotonic function. This is an important
> feature most
> people seem to miss.
Actually, according to both rfc2543 and bis, it does increase by one:
>From rfc2543:
Consecutive requests that differ in request method, headers or body,
but have the same Call-ID MUST contain strictly monotonically
increasing and contiguous sequence numbers; sequence numbers do not
wrap around.
Contiguous does imply "increment by one".
I'll admit that my recollection on this was also different; somehow I had
thought that it could increase by any amount. Incrementing by one is
probably a good thing, since ordering is near impossible without that. The
only drawback is survival across reboots. In that case, a UA may want to be
prepared to reset the current cseq on a call leg if it gets one that is
drastically higher than the previous one.
Anyway, I hope my clouded recollection is not shared by too many others...
is there anyone that has implemented an increment that is not 1?
-Jonathan R.
---
Jonathan D. Rosenberg 72 Eagle Rock Ave.
Chief Scientist First Floor
dynamicsoft East Hanover, NJ 07936
[EMAIL PROTECTED] FAX: (973) 952-5050
http://www.cs.columbia.edu/~jdrosen PHONE: (973) 952-5000
http://www.dynamicsoft.com
>
> James Undery
>
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