I don't see why not. Bits is bits is bits. Implementations might have been 3G only, then again, Wifi in phones hasn't been all that common until recently.

IIRC 3G video calls use SIP to build the video connection, so it should work for the usual inernet telephony. Also on the positive side was that video codecs were likely defined in the standard. I'm assuming the Android implementation can only call other Androids, so we have another interoperability barrier.