audio video chat

Hello All I need a chat software that supports users, one to one, one to many, with followig: 1)Chat Rooms 2)Private messages 3)audio, vidoe in rooms 4)audio vido in private message 5)File transfer 6)Blocking users 7)Contact List 8)Creating rooms 9)Users Admin Controlpanel 10)System should support at lest 1000 user 11)should work behind Firewall, etc. Thanks Albina