I was on a call the other day with a very large service provider involved in UMA. Unpromted, the technical manager on the call said: "UMA is now the bar by which we measure any other FMC technology." Excellent!
While this should be the case, it was very comforting to to hear. UMA is one of the few technologies available today. There are vendor proprietary solutions and "pre-VCC" solutions, but UMA is the first standardized approach. And frankly, I think UMA has set the comparitive bar very high.
The user experience for UMA is exactly the same on Wi-Fi as on GSM, it supports full mobility of packet services (for SIP and IMS), it fits into the existing mobile network OSS/BSS and it is quite straight-forward to deploy
Because the specification is still being finalized, it's hard to tell what a VCC product will really do. But from what I've seen so far, UMA doens't have much to worry about.
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