sipgate’s SIP client for the iPhone re-announced their SIP client for the iPhone on the 2009-10-30.
Downloaded it, started it, nice.
It can of course make us of my address book on the iPhone.
I’m not sure, I would want to use SIP over UMTS (if they don’t restrict that anyways as Skype does), but for telephone over WiFi, that’s pretty nice.

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