[SIPForum-discussion] Use case for changing contact with re-invite

[Vijay Badola]

What I think, if User has two contacts(two ip address associated with one AOR from different access network),then if User finds better connectivity with some specific access network then he can send re-invite to change its contact.

,Regards
Vijay Badola

-----Original Message-----
From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Stephen James
Sent: Thursday, May 31, 2012 11:12 PM
To: seshagiri
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Use case for changing contact with re-invite

If the SBC is using static IP for redundancy and fails over to the other IP or blade or server it will need to update with a re-INVITE.

Sent from my iPhone

On May 29, 2012, at 23:05, seshagiri <seshgirik at gmail.com> wrote:

> Hi
>
> In sip what is the use case for the scenario  to change the contact ip  with re-invite after the session establishes ?
>
> The scenario is
>
> A calls B through SBC which is B2BUA.
> After session establishes A sends re-invite to SBC with new-contact and receives 200 OK.
> This re-invite is not relayed to UA B.
>
> Now B sends BYE , SBC receives and send it to the new contact of A and receives 200 OK.
> This scenario is working fine , but  what is the use case for this ?
> i could not able to undrestand it.
>
> A -----INVITE---------->SBC -------INVITE------------>B A<
> -----200--------------SBC< ------------200------------B A
> -----ACK----------->-SBC ----------ACK------------>B A
> -----re-INVITE(New contact)--------->-SBC
>
> A< -------200-----------SBC
> A -----ACK------------->SBC
> A <-----BYE(to new contact of A)----------SBC< -------BYE------------B
>
>
> In real-time scenario what is the use of changing the contact with re-invite ?
> i think if UA using DHCP and is going to change IP after session establishment , in this case it might send re-invite with new contact , is this correct ?
>
> Pl share your views.
>
>
> Regards
> Sesh
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