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

[Hemant Kumar]

Hi Vijay, Karthik

If i understand correctly both of you are pointing to almost same scenario
where A party is trying to move call from one of his device to another. I
feel in this scenario media negotiation should also occur between A's new
device and B, but what I see in the flow mentioned by Sesh that the
Re-INVITE from A is not forwarded by SBC to B-party which is kind of
strange to me.

Please let me know if you are pointing to some different scenario.

Regards,
Hemant

On Tue, Jun 12, 2012 at 3:16 PM, Vijay Badola <Vijay.Badola at onmobile.com>wrote:

> 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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