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

[Daniel-Constantin Mierla]

Hello,

the responses to a request are routed using Via headers. The Contact is to
be used for requests within the dialog.

I am not aware of any method defined by specs to update the Via path for
ongoing transactions -- no traveling with limited available time and I
haven't looked recently at new specs to actually comment more precisely.

A solution could be to send a CANCEL to previous transaction and then
initiate a new INVITE as the device is moving from one IP to another.

Cheers,
Daniel

On Thu, May 25, 2017 at 10:08 AM, Jayesh Nambiar <jayesh1017 at gmail.com>
wrote:

> Hello Alex,
> I managed to send the UPDATE method from my endpoint but still the
> kamailio is not updating the new contact. The UPDATE method is simply loose
> routed from caller-callee when a network change is detected on the client.
> Though the UPDATE is relayed and responded back correctly; the subsequent
> response still goes to the initial contact address.
> Also when the dialog is established; kamailio correctly updates the
> contact on Re-Invite but it does not on an UPDATE method.
>
> Anything particular to be done in this case. Thanks.
>
> - Jayesh
>
> On Wed, May 24, 2017 at 3:53 PM, Alex Balashov <abalashov at evaristesys.com>
> wrote:
>
>> 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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>>
>>
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>
>
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>


-- 
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
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