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Why is UDP used more in VoIP than TCP?

If UDP is unreliable, why is it used more in VoIP rather than TCP?

If UDP is unreliable, why is it used more in VoIP rather than TCP?

The biggest reason, right off the bat, is that all routers and switches on the Internet have the ability to understand it, and route it fast and with great efficiency. As TCP is a connection-oriented protocol -- it requires a handshake and session between sender and receiver. UDP can route packets based on a variety of factors.

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