Help me when I start conference with spark ?

Hi everybody,

I have already built OpenFire Server on window 7 successful and I installed Spark on PC Clients.

When I used Red5 Audio/Video start conference with one client (one to  one ), the sound signal is very good, not problem. But if more two clients ( one to more), the sound signal isn’t good on both Network Local and Network WAN .

For example:

When I try to count 1 to 10, the other clients only hear 1,2,3 but from 4 to 10, they can’t hear, the sound signal is cracked.

I try to find bandwidth on Openfire Server but not mention on OpenFire Server.

Any advices for me ?

Thanks