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Server-grade device, such as SIP Proxy Server and IP PBX, is needed to
exchange signals of call setup between caller and called users.
Sometimes for NAT pass-thru of media (RTP), media has to be routed
through the server, when the client is located behind router and using
private IP address.
Server supports clients with telephony features, such as call forward, call
transfer, call hold, digit insert/delete …
VoIP CPE (endpoint) can work anywhere it can connect to Internet and
register to server
VoIP Operation Mode: Proxy
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