Unfortunately they are not possible yet. I was just googling to see if there was any info on it.

It turns out that there is a a new project going to implement H324M for Asterisk . This would be insanely cool.

We are a dual 3G phone household, but my Nokia 6630 insanely has only a back facing camera, so it is pretty much pointless using it. However with something like this H324M project I could use that part of my phone for various interesting internet based projects.