From: ji ma <[EMAIL PROTECTED]>

   I have some doubt about whether a UAS which is not a server (such as
   a handphone) will return 420 Bad Extension when it doesn't support
   the extension specified in Require header.

In regard to SIP, "UAS" means "user agent server", which means "in
regard to the SIP request under discussion, the user agent which
receives the request and generates the response".

Dale


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