Subject: RE: [SIP] Retransmission after provisional resp. - UAC side

From: Jonathan Rosenberg <[email-masked]>
Date: Tue, 31 Oct 2000 16:35:26 -0500

Reliability of the responses, since responses are re-sent based on request
retransmissions.

-Jonathan R.

---
Jonathan D. Rosenberg                       72 Eagle Rock Ave.
Chief Scientist                             First Floor
dynamicsoft                                 East Hanover, NJ 07936
[email-masked]                     FAX:   (973) 952-5050
http://www.cs.columbia.edu/~jdrosen         PHONE: (973) 952-5000
http://www.dynamicsoft.com

> -----Original Message-----
> From: Piotr S. Kossowski [mailto:[email-masked]]
> Sent: Tuesday, October 31, 2000 4:02 PM
> To: SIP discussion list
> Subject: [SIP] Retransmission after provisional resp. - UAC side
> 
> 
> Hello,
> 
> Let me invoke retransmission thread again:
> 
> Section 10.4.1 (rfc2543bis-02):
> 
> "(...)If the client receives a provisional response, it continues to 
> retransmit the request, but with an interval of T2 seconds.(...)"
> 
> I'm confused or I can't understand general idea of retransmission.
> 
> To my mind, Retransmission is a way for delivering 100% information
> from one entity (UAC) to another (UAS, proxy). Till the moment
> when we have not got any signal from peer that it received
> everything what we wanted to send, we should continue of delivering,
> preserving our information intact (retransmission should not carry
> new information). That's general rule.
> 
> As a server send provisional response It means that it received
> 100 % of our information - request (at least, we assuming so). Thus, 
> Retransmission of request will not supply new information to 
> the server
> (and shouldn't change server's state).
> 
> My question is: What is the reason for retransmiting of request,
> even thouht the server has confirmed reception of our request
> (by sending provisional response) ?
> 
> Thanks in advance,
> Piotr
> 
> 
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