Hi, The answer is no, at least as long as Openmoko's phones use the current TI Calypso modem. This is because UMA requires hacking in the GSM firmware itself. But the firmware has to be certified and will never be open source so that it can be modified. The only possibility would be to get a GSM firmware and hardware that support a way of "hooking" so that the appropriate software can be implemented in the modem. Also, UMA authentication requires running the GSM A3/A5/A8/cant-remember in the sim, and this facility is not provided by the AT sim commands in the modem. Outside the modem, it's only a matter of IKE and IPSec.
(Yes, I did my master degree internship on UMA, and I investigated how to do it on Openmoko ;) ) SL
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