Hi

> There's actually not an UNREGISTER method in SIP.
> As Kevin stated, you send a REGISTER with a zero expiry to cancel a
> current registration.

Yes, of course you are right there, sorry for the confusion. I was 
thinking about the resulting Asterisk CLI message:

  Unregistered SIP 'peername'

as well as a paper I recently read about so-called UNREGISTER attacks.

Philipp


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