Nokia’s lack of support for UMA in handsets, exacerbated by the latest research that they are 50% of the market for dual-mode Wi-Fi phones On the other hand, Nokia actively pushes their SIP client in devices, with a table listing devices and discussion framework.
The difference is that UMA/GAN is a technology which route VoIP calls to (and through) the mobile operator.
Whereas SIP is used by everyone but the mobile operator, primarily third party VoIP companies like Fring and Truphone.
Clearly Nokia believes in Mobile VoIP, but just not mobile VoIP for their primary customer base, the mobile operators.
All this got me thinking, why would Nokia work so hard to put SIP into their handsets when SIP isn’t used by any mobile operator today?
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