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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).

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.

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.

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.

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

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.

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).

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.