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

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.

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).

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.

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

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.

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

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.

ENUM (Telephone Number Mapping) is a protocol that is used to convert a telephone number into a domain name and then uses DNS services to map that domain to IP addresses.