[Serusers] endless authentication needed

[Benoit Pradelle]

Hi all,

I'm working on a SIP client, I'm implementing SIMPLE but during my tests
I encounter a very strange behavior with the iptel.org server.

When I send a SUBSCRIBE message with an Expires value of 0 I receive a
407 / Authentication needed, I handle the challenge correctly (I've
checked, the response value is correct) but I receive a new 407 message
with the same challenge !
It continues again and again and I'm never able to authenticate.
What is the problem ?

I can join a dump if needed.

Cheers,
Ben