[SIPForum-discussion] Handover (FMC)

[SAKCA, HALIT (HALIT)]

Hello,

nice question :) I don’t know very well but;

sip point of view media update should be informed
to client with dialog INVITE with new sdp including IP3.

I believe packet loss is depending on quality of the network, 
if wi-fi/Node equipment is well developed and it can estimate the user behavior.

regards,
Halit

From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Mauritz Jameson
Sent: lundi 29 septembre 2014 04:22
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Handover (FMC)

How does a SIP client handle handover seamlessly (from the user's point-of-view) when the user is migrating from one network to another while the SIP client is in an active SIP call?
Here's how I imagine it:
1. Client 1 is on a wifi network and assigned a public IP address IP1
2. Client 2 is on some network and assigned a public IP address IP2
3. RTP data is sent from IP1 to IP2
4. RTP data is sent from IP2 to IP1
5. Client 1 migrates from the WIFI network to a cellular network and is assigned a new IP address denoted IP3
6. Client 2 is somehow notified about client1's migration 
3. RTP data is now sent from IP3 to IP2
4. RTP data is now sent from IP2 to IP3
I'm sure that there'll be some kind of minor packet loss on both endpoints during migration ?
How is that packet loss minimized?
How is the "handover" actually done? 
Is there some kind of protocol for a handover?
Thanks