Media Gateway Controller (MGC)- Definition
A Media Gateway Controller (MGC) is a system used in certain Voice over IP telephony architectures. An MGC controls a number of Media Gateways or Media Servers. The MGC receives signalling information (like dialed digits) from the Media Gateway and can be instructed to alert the called party, to send and receive voice data etc. There are several protocols which can be used between MGC and Media Gateway, the primary being MGCP and Megaco (also known as H.248).
The Media Gateway Controller functionality is commonly integrated inside the Softswitch function of a VoIP network. Some MGCs can interface with additional signalling protocols, like SS7 (for interconnection with the traditional telephone system), H.323 and SIP, and integrated with Media Gateways, which are called “Signalling Gateways”.
In the IMS architecture, a Media Gateway Controller Function (MGCF) controls the resources in Media Gateways with an H.248 interface. Another Media Gateway Controller function in IMS is the MGC that controls the Media Server (Media Resource Function Processor – MRFP) - Media Resource Function Controller (MRFC), which is a signalling plane node that acts as a SIP User Agent to the S-CSCF, and which controls the MRFP with a H.248 interface.
Media Gateway Controller (MGC) - Synonyms
Media Gateway Controller, MGC, Media Gateway Control Function, MGCF, Media Resource Function Controller, MRFC, Signaling Gateway, Class 4 Softswitch, VoIP Signaling Gateway