VoIP protocols VoIP protocols Distributed Universal Number Discovery (DUNDi) is a P2P protocol for providing services equivalent to those provided by ENUM. DUNDi has an advantage above ENUM in that is far more resilient, as it lacks a central point of failure. It is also easy to deploy in that there will likely not be a lot of political problem due to its lack of need for central control. Though DUNDi can be used to augment DNS, it is currently being developed with VOIP being the most immediate beneficially. This will allow, for example a number like 732 432 5432 to be mapped on either an IPv4 or IPv6 address. VOIP providers will benefit in that they will eliminate the need to use PSTN circuit to carry traffic between two VOIP customers. For example, a customer using Vonage would call a customer using FWD without ever needing a VOIP to PSTN gate way. ...more on Wikipedia about "Distributed Universal Number Discovery"
H.323 is an umbrella recommendation from the ITU-T, that defines the protocols to provide audio-visual communication sessions on any packet network. It is currently implemented by various Internet real-time applications such as NetMeeting and GnomeMeeting (the latter using the OpenH323 implementation). It is a part of the H.32x series of protocols which also address communications over ISDN, PSTN or SS7. H.323 is commonly used in Voice over IP (VoIP, Internet Telephony, or IP Telephony) and IP-based videoconferencing. ...more on Wikipedia about "H.323"
IAX is the Inter-Asterisk eXchange protocol used by Asterisk, an open source PBX server from Digium. It is used to enable VoIP connections between Asterisk servers, and between servers and clients that also use the IAX protocol. ...more on Wikipedia about "IAX"
The IP Multimedia Subsystem (IMS) is a standardised Next Generation Networking (NGN) architecture for telecom operators that want to provide mobile and fixed multimedia services. It uses a Voice-over-IP (VoIP) implementation based on a 3GPP standardised implementation of SIP, and runs over the standard Internet Protocol (IP). Existing phone systems (both packet-switched and circuit-switched) are supported. ...more on Wikipedia about "IP Multimedia Subsystem"
In computing, Media Gateway Control Protocol (MGCP) is a protocol used within a Voice over IP system. MGCP is defined in an informational (non-standard) IETF document, RFC 3435 , which obsoletes an earlier definition in RFC 2705. It superseded the Simple Gateway Control Protocol (SGCP). ...more on Wikipedia about "Media Gateway Control Protocol"
The Network Voice Protocol (NVP) was a pioneering computer network protocol for transporting human speech over packetized communications networks. It may be viewed as an ancestor of today's Voice over IP protocol suite. ...more on Wikipedia about "Network Voice Protocol"
Session Initiation Protocol (SIP) is a protocol developed by the IETF MMUSIC Working Group and proposed standard for initiating, modifying, and terminating an interactive user session that involves multimedia elements such as video, voice, instant messaging, online games, and virtual reality. In November 2000, SIP was accepted as a 3GPP signaling protocol and permanent element of the IMS architecture. It is one of the leading signalling protocols for Voice over IP, along with H.323. ...more on Wikipedia about "Session Initiation Protocol"
SCCP is a proprietary terminal control protocol originally developed by Selsius Corporation. It is now owned and defined by Cisco Systems, Inc. as a messaging set between a skinny client and the Cisco CallManager. Examples of skinny clients include the Cisco 7900 series of IP phone such as the Cisco 7960, Cisco 7940 and the 802.11b wireless Cisco 7920. Skinny is a lightweight protocol which allows for efficient communication with Cisco Call Manager which may act as a proxy for signalling of call events with other common protocols such as H.323, SIP, ISDN and/or MGCP. ...more on Wikipedia about "Skinny Client Control Protocol"
Ventrilo is a popular, freeware Voice over IP program. Users install and run the Ventrilo client and connect to a Ventrilo server. The ventrilo client is available for Microsoft Windows and Mac OS X, and planned for the Linux operating system. Servers are available for all of these systems as well as Solaris, NetBSD and FreeBSD. ...more on Wikipedia about "Ventrilo"
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