From: [EMAIL PROTECTED] (Juha Heinanen)

   i think it is mandatory for sip phones to support tel.  otherwise it is
   impossible to for a sip phone in another domain to 302 caller to a pstn
   number.

Well, I don't think it's *mandatory* (RFC 3261, section 7.1):

           SIP elements MAY support Request-URIs with schemes other than
           "sip" and "sips", for example the "tel" URI scheme of RFC
           2806 [9].

Dale
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