> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
> Sent: Monday, November 19, 2001 12:30 AM
> To: [EMAIL PROTECTED]
> Cc: '[EMAIL PROTECTED]'
> Subject: [Sip-implementors] About Reliable Provisional Responses
>
>
>
>
> Hello All,
>
> This is about the RPR Draft(draft-ietf-sip-100rel-04.txt).
> I am referring the chapter 7 (Retransmit Interval Computation).
>
> Herein we have the text
>
> " The retransmission interval for reliable provisional
> responses starts
> at 500 ms, and doubles after each retransmission, up to a
> maximum of
> 16 seconds. This mirrors the behavior of INVITE requests in [1]. If
> no PRACK is received for that response after 40 seconds, it is
> considered a network or endpoint failure. Behavior at that point is
> at the discretion of the implementor."
>
>
> If we now take into consideration the RFC2543bis-05 I have
> two points to
> make:-
>
> 1>Is the retransX interval really mirrorring behaviour of
> INVITE requests
> as in bis05? Since according to the
> to bis05 ,INVITE requests keep retransmitting with 2*T1
> until the timer B
> fires(64*T1).
These are indeed the same. With T1=500ms, you get a total of 32 elapsing
between the first request and the last. Thats the same as the case where you
transmit until the last retransmit interval is 16s:
x---x----x------x----------x-------------x------------------------------x
1/2 1 2 4 8 16
1/2 + 1 + 2 + 4 + 8 + 16 = 31.5s
>
> 2>Also, (how) does the value 40 change for bis05 implementors?
I don't know yet. I have yet to integrate 100rel into bis-05, and I will
certainly be unifying some of the timeouts. I suspect it will be made to
mirror 2xx behavior.
>
> 3>Do we follow behaviour of INVITE requests in bis-05 for our
> implementation of RPR retransmission, without taking into account the
> actual values 16,40.
It doesn't matter much. There is no loss of interop when you change the
values of these timers. Indeed, all of these timers have defaults that are
changeable...
-Jonathan R.
---
Jonathan D. Rosenberg, Ph.D. 72 Eagle Rock Ave.
Chief Scientist First Floor
dynamicsoft East Hanover, NJ 07936
[EMAIL PROTECTED] FAX: (973) 952-5050
http://www.jdrosen.net PHONE: (973) 952-5000
http://www.dynamicsoft.com
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