Six Major VoIP Protocols

H.323 - ITU standard protocol for interactive conferencing

MGCP (Media Gateway Control Protocol) - a method of PSTN gateway control or thin device control

Megaco/H.248 - joint IETF/ITU standard protocol that provides full call control intelligence

SIP (Session Initiation Protocol) - a protocol that specifies commands and responses to set up and tear down calls (end-to-end call signaling); text based

RTP (Real-time Transport Protocol) - an IETF media streaming protocol

RTCP (Read-time Transport Control Protocol) - provies out-of-band control information for an RTP flow

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