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Jeff Hiltz

Great post Martin, this got me digging into the voice over LTE issues a bit further, so thanks for the great links.

I've never been a huge fan of the UMA/GAN approach - as it really seems to just carry on the closed network architecture of the mobile operators rather than becoming more open and allowing for more intelligence at the edge of the network.

For handovers between Circuit (CS) and Packet (PS) - VCC provides a more operator agnostic method of handling this functionality. It would be interesting to see VCC re-born for the purposes of handling handover between LTE and GSM at least for the application level services such as Google Voice.

With VCC - Google, Skype or any other internet based voice service could throw a VCC server into their own network, add a few handover numbers and suddenly allow handoff between an IP network (such as LTE) and the traditional circuit switched GSM network. Yes, they would need to develop some client side intelligence into the mobile VoIP client that could recognize the degrading LTE network as well as initiate the handover - however with operating systems trending to be more open with OS's like Android, I would expect that more and more the necessary programming interfaces will be there to allow such functionality.

Perhaps we'll end up with a Network based approach being UMA/GAN/VoLGA, and an Applications approach using VCC.

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