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Media Gateways are used for transcoding media between PSTN and IP networks. A media gateway is a translation device or service that converts media streams between disparate telecommunications technologies such as POTS, SS7, Next Generation Networks (2G, 2.5G and 3G radio access networks) or private branch exchange (PBX) systems.
The media gateways provide conversion of traditional electronic media to the Internet Protocol (IP) network. The protocol is a successor to the Simple Gateway Control Protocol (SGCP), which was developed by Bellcore and Cisco , and the Internet Protocol Device Control (IPDC).
Media gateway protocols were developed based on the Internet model of networking, the Internet Protocol Suite, and are referred to as device control protocols. A media gateway is a device that offers an IP interface and a legacy telephone interface and that converts media, such as audio and video streams, between them.
The Gateway Control Protocol (Megaco, H.248) is an implementation of the media gateway control protocol architecture for providing telecommunication services across a converged internetwork consisting of the traditional public switched telephone network (PSTN) and modern packet networks, such as the Internet.
A media gateway controller function (MGCF) is a SIP endpoint that interfaces with the SGW over SCTP. It also controls the resources in a Media Gateway (MGW) across an H.248 interface. A media gateway (MGW) interfaces with the media plane of the CS network, by converting between RTP and PCM.
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The Media Object Server (MOS) protocol allows newsroom computer systems (NRCS) to communicate using a standard protocol with video servers, audio servers, still stores, and character generators for broadcast production. [1] [2] The MOS protocol is based on XML. [3] It enables the exchange of the following types of messages: [4]