VoIP network elements
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call agent
A repository for a VoIP network's dial plan.
IP phone
A telephone with an integrated Ethernet connection. Although the users speak into a traditional analog headset on the IP phone, the IP phone digitizes the spoken voice, packetizes it, and sends it out over a data network.
gateway
Acts as a translator between two different telephony signaling environments.
RTP
Real-time Transport Protocol (RTP) is a Layer 4 protocol that carries voice (and interactive video).
SIP
Session Initiation Protocol (SIP) is a VoIP signaling protocol used to set up, maintain, and tear down VoIP phone calls.