[SIPForum-discussion] Handover (FMC)

[Mauritz Jameson]

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
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