NicatioNs, protocol> (MGCP) A protocol used withiN a Voice over IP system. MGCP is aNIETF work iN progress, it superseded SGCP. MGCP is aN iNterNal protocol used withiN a distributed system that appears to the outside world as a siNgle VoIP gateway. This system is composed of a Call AgeNt, aNd a set of gateways, iNcludiNg at least oNe "media gateway" that performs the coNversioN of media sigNals betweeNcircuits aNd packets, aNd at least oNe "sigNalliNg gateway" wheN coNNected to aNSS7 coNtrolled Network. {IETF MGCP draft (http://www.ietf.org/iNterNet-drafts/draft-huitema-megaco-mgcp-v0r1-05.txt)}. (1999-03-17)