Last telepathy-kde update (I use Arch Linux) shows audio and video call actions but:

- these actions are disabled for my google talk contacts (while the contacts has all needed hardware, and video chats are possible via, say, pidgin),
- if somebody calls me (say, via Chromium) - I mean video call - nothing happens.

Are there some hidden (or not obvious) configurations I have missed to enable video-chatting between google talk clients?

Have you installed "ktp-call-ui"?