From: Arif <[EMAIL PROTECTED]>

   while testing my proxy server I encountered this Proxy-Require Header 
   Proxy-Rquire : 55.55.55.55 (IP)

   the proxy sends 420 in response to this Proxy-Require header..

   but i tried to look up in rfc's related to sip about the meaning of
   this particular Proxy-Require value but didn't get a clear
   picture.. 

   Can any one please enlighten me on this issue ?

The syntax is given at the top of page 231, RFC 3261.  The processing
is discussed in RFC 3261, section 16.3, item 5.

In this case, the Proxy-Require header is syntactically incorrect, as
"55.55.55.55" is not a "token".  Since all proxies are required to
reject a request with a 420 response if the request contains a
Proxy-Require header with a value that is not an option-tag that it
understands, and since since "55.55.55.55" can never be an option-tag,
the proxy is acting correctly.  The UA that is sending that field is
erroneous.

Dale
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