In such cases 403 Forbidden shall have Retry-After header field giving the 
number of seconds client has to wait before sending the next REGISTER request.

Somesh

-----Original Message-----
From: sip-implementors-boun...@lists.cs.columbia.edu 
[mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of ext 
Pavesi, Valdemar (NSN - US/Boca Raton)
Sent: Monday, July 13, 2009 7:49 PM
To: ext Dale Worley; Michael Hirschbichler
Cc: sip-implementors@lists.cs.columbia.edu
Subject: Re: [Sip-implementors] Registration - Challenging Question

If there is 401 back is because the Credentials are not correct:
username ,password , realm, nonce...

You do need a trace in our system.

Normally after some retries  ( nounce counter) then there is a final 403
response  to stop the loop. Register/401.

Valdemar


-----Original Message-----
From: sip-implementors-boun...@lists.cs.columbia.edu
[mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of ext
Dale Worley
Sent: Friday, July 10, 2009 4:31 PM
To: Michael Hirschbichler
Cc: sip-implementors@lists.cs.columbia.edu
Subject: Re: [Sip-implementors] Registration - Challenging Question

On Thu, 2009-07-09 at 13:33 +0200, Michael Hirschbichler wrote:
> UAC                               Proxy
> ------------REGISTER---------------->
> <----401 Unauthorized (w challenge)--
> ---REGISTER (w correct Credentials)->
> <----401 Unauthorized (w challenge)--
> 
> (The credentials are correct and the 401 are no retransmissions)
> 
> How should the client now behave? Should he retry to register using
the 
> Digest from the last "401"? How often should the client retry until he

> stops trying to register?

The expectation is that an immediate re-REGISTER will not succeed, and
that the UA has to wait for some "external" change.  So it should send
re-REGISTERS at a slow pace, waiting to detect the "external" change.

Dale


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