You have bring me to a cool idea.
Because i have here a UMTS-USB-dongle with voice support.
On Github exist diverse source for Asterisk13-chan-dongle.
I try this one: https://github.com/wdoekes/asterisk-chan-dongle
and voice works very well.
Here are the modules: asterisk13mod64-3.7z
now inclusive chan-mobile, ooh3, mp3 and chan-dongle
and here are the buildscripts: asterisk13buildscrips3.7z
you need subversion to use them
But i will use them on my Arcadyan VGV7510KW22 (aka O2Box-6431) router.
The Buildscripts are on this post