RTP audio and video not transport via asterisk?


I would like to do with asterisk:

  1. When een UA A calls another UA B via an asterisk server, the audio-RTP call must go directly von A to B and not via the asterisk server. How is it possible ? How must I configure asterisk and what are the disadvantages ?

2)When the call is setup with A and B, I would like to have also a video stream von A to B. There is one IP-camera on the A-side and i would like to give the IP adress von the camera to B. Something like that. Is it possible with asterisk and how can I configure it. Did I need SER ?

Thanks in advance