You can make use of Record-Route header

Let Proxy insert the Record-Route header in the forwarded INVITE request.
then all the subsequent requests will pass through proxy.

sec 16.12.1.2 or 3261 might be helpful to you.....

16.12.1.2 Traversing a Strict-Routing Proxy


On Wed, Mar 28, 2012 at 11:33 AM, Jerry George <[email protected]> wrote:

> Hi all,
>
> Consider a Simple 2 Party Call Set up scenario with a Proxy Server (with
> Registrar) on Sailfin Server. The book says if after the call is set up the
> BYE msg is sent directly to the client. If the two parties are X-Lite
> clients, how do I redirect the requests through the proxy server?
>
> X-Lite Client's are configured with the Proxy Server IP address. However,
> the BYE msg is never received at the Proxy.
>
> I tried intercepting SIP messages via Wireshark, but it does work either. I
> am not able to view a single SIP or SIP/SDP messages. I would also very
> much appreciate any answer on this as well.
>
> Apart from this, you might notice that IPv6 IP is used for the Proxy Server
> below, (actual IP is 192.168.1.19)
>
> Sample Request:
>
> "INVITE sip:[email protected]:10268 SIP/2.0
> Max-Forwards: 70
> Contact: <sip:*2001:0:4137:9e76:3c8c:35f3:b3be:51ca*:5060;fid=server_1>
> To: <sip:[email protected]:10268>;rinstance=03ce53c91e81dcdd
> Cseq: 1 INVITE
> From: <sip:[email protected]:6566
> >;rinstance=4cf56729a73b4add;tag=h0bxeapg-19
> Call-Id: 2001:0:4137:9e76:3c8c:35f3:b3be:51ca_7_4123155747477448090"
>
> Thanks much, in advance!
>
> Best regards,
> Jerry
> _______________________________________________
> Sip-implementors mailing list
> [email protected]
> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
>



-- 
Thanks,
Nataraju A.B.
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