[Telepathy] call example

[Nicola De Filippo]

Hi,
i have tried call example (telepathy 0.21) with two gtalk account. I have this 
problem: in example software i show all video, as on N900 i have black screen 
(i have tried also with n900 and officialc gtalk and i all ok). Where is the 
problem?
              Best regards
                        Nicola