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

[Alex Balashov]

Hi Jayesh,

This is the exact purpose of UPDATE - to update the dialog remote target before the dialog is established. 

But of course, properly implementing and following it is up to the endpoints. 

-- Alex

> On May 24, 2017, at 5:46 AM, Jayesh Nambiar <jayesh1017 at gmail.com> wrote:
> 
> 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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