It wasn’t that long ago we speculated that pjsip on BlackBerry would be available sooner rather than later.
Well apparently it’s true: Tru has ported pjsip to BlackBerry 10 (a.k.a BB10, snappy though somewhat unimaginative).
So there you go. BB1o has stolen the thunder of us native C developers. Windows Phone 7 (a.k.a WP7), are you scared now?
pjsip blog 
The advancements in VoIP are just outstanding. With 4g service coming to most areas I think that it’s going to be feesable to place quality voip calls over 4g.