idea for video conference.

1. solve connection bandwidth and delay problem.--also can solve server connection problem.
    using netmeeting or Polycom device to make a conference.
2. using WebEx to avoid connection problem
3.using ISDN.  发起方呼叫则费用低
ps:中转流量到速度快的他国
device choise:Polycom device IP and ISDN port.
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原文地址：https://www.cnblogs.com/jjkv3/p/903535.html