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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