> RFC 3261 says Before a request is sent, the client > transport MUST insert a value of the "sent-by" field with > FQDN or IP and Port into the Via header field.
> Via: SIP/2.0/UDP pc33.atlanta.com;branch=z9hG4bKnashds8 The portion "pc33.atlanta.com" is called the "sent-by field". Compare with the BNF rules "Via" and "via-parm" in section 25.1 of RFC 3261. Dale
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