![]() ![]() In a restrictive environment where only UDP port 3478 is allowed, Alice must relay media through a TURN server to connect with Bob. UDP traffic blocked on ports 10000 - 65535 but allowed on port 3478. In general, UDP ports are often used for media transmit: Prepare your organization's network for Microsoft Teams - Network requirements. From public official document, UDP port 3481 and TCP port 443 both are needed for service connections, media flows of Teams meeting and conferencing (including live events). Relay : 52.113.192.2 is reachable using Protocol TCP and Port 443 Relay : 52.113.192.2 is reachable using Protocol UDP and Port 3478. ![]() Relay : 13.107.65.5 is reachable using Protocol HTTPS and Port 443. Relay : 13.107.65.5 is reachable using Protocol TCP and Port 443. Relay : 13.107.65.5 is reachable using Protocol UDP and Port 3478.The media flows on these ports are protected with a key that is. A client uses these two ports to allocate UDP and TCP ports respectively to enable these media flows. The UDP 3478-3481 and TCP 443 ports are used by clients to request service for audio visuals. Attention!Yes, Teams does use port 443 for audio and video: "UDP 3478-3481 and TCP 443. Only when a connection is set up user's data can be sent bi-directionally over the connection. ![]() TCP is a connection-oriented protocol, it requires handshaking to set up end-to-end communications. TCP is one of the main protocols in TCP/IP networks. TCP port 3478 uses the Transmission Control Protocol. ![]()
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