STUN演示程序源码，能穿过绝大多数防火墙NAT等.演示实际际应用中的VOIP上UDP通信体系 可直接使用。 已通过测试。 -STUN demo program source code, can pass through most firewalls and NAT applications demonstrates the actual occasion of VOIP UDP communication system can be used directly. Has been test