[SR-Users] in-dialog contact update before dialog being confirmed

[Jayesh Nambiar]

Hello,
In a user-user based calling on mobile apps, when the call is connected and
the user moves from a Wifi to Mobile data (network change); the device
sends a Re-Invite with new contact information and subsequent messages go
to appropriate changed contact address.
But when the dialog is in say ringing state; and the caller moves from one
network to another; what would be an appropriate SIP method to trigger the
contact update. My problem is generating a Re-INVITE or an UPDATE before
the call is connected is very difficult.
What I tried is sending an in-dialog INFO message with new contact address;
which gets relayed to the called party and the response for INFO is also
properly received on the new contact address. But the subsequent response
of the INVITE like a 486 or 200 goes to the original contact only.
What would be the best way to update the contact address of a client if I'm
maintaining all the dialogs in kamailio.

Thanks,

- Jayesh
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