Video Conferencing over VSAT Link ?

Hi,
Is it possible to have a video conferencing using 2921 CME 8.6 router and 9951 video IP Phone over VSAT Link ?
If yes then what should be the max latency that is acceptable ? What should be the bandwidth ?
Plz help me out with this.
Regards,
Gaurav

bandwidth should be at least 384k or 512k

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