I've just made the first video call from Telepathy 0.x on my main laptop to Telepathy 1.x on a development laptop.
We should gather up versions that are sufficient to make this work, and call it 0.99.10 or something. (I'd say 0.99.9, but I already released telepathy-glib 0.99.9, and it doesn't have all these changes in.)
I'll use this as a metabug for reviewing the changes I made.
In addition to the Telepathy patches, we need a couple of Folks patches:
... and Empathy, <https://bugzilla.gnome.org/show_bug.cgi?id=727043>.
I think that's everything from my test setup. I also had to update GLib, Gtk and Zeitgeist.
0.99.10 is this snapshot.