Video VoiP support?

Fairly new to the VoIP world. Wanted to know if Asterix will support H.263 video codecs under H.323/H.245/H.225 comms protocols ?

i.e. is it possible to route/convert H.323 Voice & Video IP calls to/from SIP and other protocols ?

Any one know about bandwidth requirements or calculators which encompass IP Video telephony ?

Wanting to set up infrastructure and media-gateway (pref Asterix) for ITSP hosting services. :confused: :confused: