Video calls or IVVR progress in Asterisk

Dear All,
Can anyone tell the progress of Video calls or IVVR(Interactive Video and Voice Response ) in asterisk. Like the same way we make outbound audio calls to SIP/GSM channels can we make video call to mobiles or SIP phones as 3g is supported by all operators all over the world.
If its implemented already in asterisk can any one send the useful links to make it.I saw some links in but is not sufficient to make a practical implementation.