MGCP/MEGACO

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MGCP/MEGACO

(Media Gateway Control Protocol/MEdia GAteway COntroller) An IP telephony signaling protocol from the IETF. MGCP was the original protocol, which evolved into MEGACO. Both protocols are designed for implementation in IP phones that are lower cost than SIP or H.323 phones. MGCP/MEGACO requires the use of softswitches for call control and more resembles the telephony model of the circuit-switched PSTN than do SIP and H.323. The softswitch is aware of the entire call throughout its duration (it manages state) and enables operator intervention like the PSTN. MCGP/MEGACO is a combination of the SGCP and IPCD protocols, and many devices that implement MGCP/MEGACO also support SIP and/or H.323.

At the IETF, MGCP evolved into MEGACO, while work on MGCP continued at the International Packet Communications Consortium (www.packetcomm.org). Network Call Signaling (NCS) is CableLab's version of MGCP, and H.248 is the ITU's version.

MGCP/MEGACO uses "terminations" and "contexts." Terminations are points of connection that are assigned an ID by the media gateway and can be permanent or ephemeral (temporary). Contexts are the sessions between these terminations and are managed by the media gateway controller. Like SIP, MEGACO is a text-based protocol, unlike H.248, which is binary based. See H.323 and SIP.
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References in periodicals archive ?
MEGACO protocol test suite supporting conformance testing
A Media Gateway Controller (MGC) controls the various elements within the IP Network using SIP, MEGACO, and MGCP protocols.
He added, "The MEGACO protocol is implemented in binary encoding over 2G/3G core network.
"GL also provides testing and simulation tool that is designed not only to monitor RTP and RTCP packets, but also to allow users to manually create and terminate RTP sessions, independent of call-signaling protocols such as SIP, H323, MEGACO, or MGCP.
Kulkarni further explained, "GL's MAPS[TM] is a protocol simulation and conformance test tool that supports a variety of protocols such as SIP, SIP I, MEGACO, MGCP, SS7, ISDN, GSM, MAP, CAS, LTE, UMTS, SS7 SIGTRAN, ISDN SIGTRAN, Diameter and others.
Almost all VoIP and Wireless protocols such as SIP, MGCP, MEGACO, H.323, Skinny, LTE, Diameter, UMTS, GSM, and GPRS carried over SCTP transport layer (Link) can be captured, decoded, filtered, and analyzed.”
He added, “RTP ToolBox[TM] is designed to generate and monitor RTP and RTCP packets independent of call-signaling protocols such as SIP, UMTS, GSM, SIP-I, H.323, MEGACO, or MGCP.
Mr.Vadalia further explained, “Message Automation & Protocol Simulation (MAPS[TM]) is a powerful protocol test simulation platform supporting a wide ranging protocols such as SIGTRAN (SS7 over IP), SS7 over TDM (T1 E1), ISDN over TDM (T1 E1), GSM-A & GSM-Abis over TDM, Megaco, SIP, and MGCP over IP.
Karthik Ramalingam Manager Product Development of the company said, “GL's Message Automation & Protocol Simulation (MAPS[TM]) is a protocol simulation and conformance test tool that supports a variety of Wireless, IP, and TDM protocols such as SIP, MEGACO, MGCP, SS7, ISDN, GSM, MAP, CAS, LTE, UMTS, SS7 SIGTRAN, ISDN SIGTRAN, SIP I, GSM AoIP, Diameter and many others.
Media Gateways can be similarly integrated using MAPS[TM] software products, for Media Gateways high density T1 E1 Cards and MAPS[TM] Megaco or MAPS[TM] MGCP is required.
“Applications supporting G.722 over IP are: PacketScanTM is a versatile Packet Analyzer for VoIP that supports many signaling protocols like H.323, SIP, RTP, Skinny, Megaco, and more.
Supported protocols include SIP, MEGACO, MGCP, H.323, SCCP, RANAP (UMTS IuCS), and GSM A.