----- Original Message ----- 
From: "Paul Kyzivat" <[EMAIL PROTECTED]>
<snip>
>  A way that is conformant with 3261 is to use the 
> ability to embed a sip header in a sip URI. This is 
> something like:
> 
>    Contact: <sip:[EMAIL PROTECTED]:proxy.example.com%3E>
> 

RFC 3261 actually discourages this sort of thing. Section 19.1.5 says:

   An implementation SHOULD NOT honor any requested Route
   header field values in order to not be used as an
   unwitting agent in malicious attacks.


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