audio, video chat

I would like a complete chat system or a modification of my existing chat (flashchat) which would integrate with my existing site (on a mambo CMS). I would like audio and video capabilities. and also chat archives. I would also require a one one one chat inside this like a live support where site staff can provide various paid services for purchased minutes. The billing of minutes is already handled. All we need from this chat is the time talked for each so that we will know remaining time left for the clients minutes. i can give u more details and site specifications if required.