What are the incompatibilities of libjingle and XEP-0166 et al?

Question

libjingle\'s developer guide quite vaguely mentions incompatibilities between libjingle\'s implementation of Jingle and XEP-0166\'s specification. It also mentions it is inc

Answer 1

I've dug out specs for Google Talk's implementation (that is, the "old" libjingle): Google Talk Call Signaling. Compare with: XEP-0166

Not only that, but it appears Google finally updated libjingle to 0.5 to support both GTCS and XEP-0166.

I'll be accepting my own answer; nonetheless, a "thank you" goes to liori!