Subject: [Sip] rport binding

From: "Thejeswara Reddy.P" <[email-masked]>
Date: Fri, 23 Sep 2005 05:25:35 +0100 (BST)

When there is a NAT between the client and server, the request will
create (or refresh) a binding in the NAT.  This binding must remain
in existence for the duration of the transaction in order for the
client to receive the response.

proxy forwards the INVITE request as

   INVITE sip:[email-masked] SIP/2.0
    Via: SIP/2.0/UDP proxy.example.com;branch=z9hG4bKkjsh77
    Via: SIP/2.0/UDP 10.1.1.1:4540;received=192.0.2.1;rport=9988
    ;branch=z9hG4bKkjshdyff

now why we need the field in the Via header; When the NAT maintains the binding

         SIP/2.0/UDP 10.1.1.1:4540 

thanks

theja

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