Subject: [Iptel] Transfer of the trunk group in the backward direction

From: "Alexeitsev, D" <[email-masked]>
Date: Wed, 11 Oct 2006 15:52:19 +0200

Hello altogether

The draft draft-ietf-iptel-trunk-group-09 currently defines the way of
transporting the originating (incoming) trunk group information in the
forward direction.

Was it discussed to define the transport of the destination (outgoing)
trunk group information in the backward direction? 

The use case could be the indication of the sized outgoing circuit
(TG2-2) from the breakout gateway (GW2) to the originator of the call. 

         GW1           SIP Proxy           GW2
          |               |                 |
---IAM--->|               |                 |
          +---INVITE----->|                 |
          |               +---INVITE------->|  Trunk TG2-2
	    |               |                 +------IAM------> 
	    |               |<---200 Ok-------+ 
   	    |<---200 Ok-----+                 |
	    |			  |			  | 

Could the outgoing trunk group information be reported back for example
in the Contact header of the 200 response to the INVITE?

Greetings,
Denis Alexeitsev

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