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List:       sip-implementors
Subject:    [Sip-implementors] URI parameter in To and From headers
From:       "Biju Kayakal" <bijuka () nortel ! com>
Date:       2007-07-31 22:08:54
Message-ID: C5A96676FCD00745B64AE42D5FCC9B6E12C47ED0 () zrc2hxm0 ! corp ! nortel ! com
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Hi All,
           A SIP endpoint receives a request containing the transport
param as URI parameter in the To header ? 
E.g.
To: <sip:97775551000@45.60.51.41;transport=tcp>

Should it copy this URI parameter in the To header when it forms the
response ? 
Also should it also copy this URI param into the From header when it has
to send subsequent requests within this dialog ?

RFC 3261 stats that when forming responses,
"If the To header field in the request did not contain a tag, the URI in
the To header field in the response MUST equal the URI in the To header
field"

And for subsequent transactions:
"The From URI of the request MUST be set to the local URI from the
dialog state"

How should the URI parameters be handled in this regard ?

Any inputs would be appreciated.

Thanks
-Biju

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