Free Switch处于防火墙内，因此需要在防火墙上开启相关端口映射，否则无法接收到数据包.
下表为各个模块默认使用的端口列表:
FireWall Ports Network
Protocol Application Protocol Description
1719 UDP H.323 Gatekeeper RAS port
1720 TCP H.323 Call Signaling
3478 UDP STUN service Used for NAT traversal
3479 UDP STUN service Used for NAT traversal
5002 TCP MLP protocol server
5003 UDP Neighborhood service
5060 UDP & TCP SIP UAS Used for SIP signaling
(Standard SIP Port, for default Internal Profile)
5070 UDP & TCP SIP UAS Used for SIP signaling (For default "NAT" Profile)
5080 UDP & TCP SIP UAS Used for SIP signaling (For default "External" Profile)
8021 TCP ESL Used for mod_event_socket *
16384-32768 UDP RTP/ RTCP
multimedia streaming Used for audio/video data in SIP and other protocols
5066 TCP Websocket Used for WebRTC
7443 TCP Websocket Used for WebRTC
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