VoIP Interfaces

VoIP using standard ITU (International Telecommunication Union) H.323 standard for communication. H.323 standard consists of components, protocol, and procedures that provide multimedia communication via packet-based network. The form of packet-based network that can be passed between other Internet network, Internet Packet Exchange (IPX)-based, Local Area Network (LAN) and Wide Area Network (WAN). H.323 can be used for multimedia services such as voice communication (IP telephony), video with voice communication (video telephony), and combined voice, video and data.

Design and development goal is to enable H.323 interoperability with other types of multimedia terminals. With a standard terminal H.323 can communicate with H.320 terminals on the N-ISDN, H.321 terminals on the ATM, and H.324 terminal switched on the Public Telephone Network (PSTN). Terminal H.323 real-time communication allows two-way form of voice, video and data. H.323 standard consists of 4 components of physical I used when connecting communication multimedia point-to-point and point-to-multipoint on some kind of network:

Terminal
multimedia communications for the real-time two-way. Terminal H.323 can be a personal computer (PC) or other means of self that can run multimedia applications.

Gateway
Used to connect two different networks, namely between H.323 network and a network of non H.323, for example, the gateway can connect and provide communication between the terminals with H.233 phone network, for example: PSTN. In the form of a network connecting the two different done with the protocols for call setup and release and send information between networks connected to the gateway. However gateway is not needed for communication between the two terminals of H.323.

Gatekeeper
Can be considered as a brain on the network because H.323 is a point important in the H.323 network.

MCU
Used to service the terminal H.323 conference three or more. All terminal who want to participate in the conference can build relationships MCU with the materials for the conference, negotiations between terminals to ensure the audio or video coder / decoder (codec). According to the H.32 standard, a MCU consists of a Multipoint Controller (MC) and several Multipoint Processor (MP). MC Negotiations handle H.245 (concerning signaling) between the terminals to determine the ability audio and video processing. MC also to control and determine the series audio and video will be multicast. MC does not face directly the media. This task was given to the MPs who make Mix, switches, and process audio, video, or bits - bits of data. Gatekeeper, gateway, MCU and the logic is a separate component in the standard H.323 but it can be implemented as a means of a physical.