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SIP (Session Initiation Protocol) is used for signaling and controlling multimedia communication sessions such as voice and video calls over Internet Protocol (IP).

RTP (Real-Time Protocol) is used for delivering audio and video over IP networks, ensuring that data is delivered in real-time.

SDP (Session Description Protocol) defines the standard for describing multimedia sessions for the purposes of session announcement, invitation, and other forms of multimedia session initiation.

H.323 is a standard that provides specifications for equipment, network, and services for multimedia communication over packet-based networks like the Internet.

MGCP (Media Gateway Control Protocol) is a protocol used for controlling media gateways on Internet Protocol (IP) networks connected to the public switched telephone network (PSTN).

SCCP (Skinny Client Control Protocol) is a proprietary network protocol system developed by Cisco Systems for the transmission of signaling messages within a Cisco Unified Communications (VoIP) network.

XMPP (Extensible Messaging and Presence Protocol) is a communications protocol for message-oriented middleware based on XML, primarily used for instant messaging and presence information.

The RTP Control Protocol (RTCP) is a companion protocol to RTP that is used for monitoring the quality of service and conveying information about the participants in an ongoing RTP session.

IAX (Inter-Asterisk eXchange) is a protocol native to the Asterisk PBX and is used for transporting VOIP traffic between servers and to terminal devices.