[CentOS] package recommendation for video conferencing

Hi.

We have a need for a video conferencing package with the following specs:

- cross platform client support (Linux, Mac, Win)
- server side runs on Centos 5 and later with easy package installation routine (e.g. RPM)
- can host a teleconfernce with no users connected (IOW, it can wait for users to connect at any time)
- supports mulitple users per video conference


Recommendations?

Thanks.

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