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(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 ( 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 ?
The gene closest to this hotspot is FOLH1 (folate hydrolase 1) and could thus be the genetic factor that affects this relationship.
The genes that were more highly expressed in carcinomas treated with androgen ablation agents included those encoding AR and steroid biosynthetic enzymes, as well as a suite of genes that have been previously shown to be targets of AR or have been implicated as being regulated by it, including the gene encoding PSA (kallikrein-related peptidase 3), KLK3, and KLK2, as well as DBI, FASN, IL6, SERPINB5, TGFBR3, TMPRSS2, TUBA1, HOXC6, TRG ,and FOLH1. (61-66) Other upregulated genes may represent secondary, indirect effects of androgen ablation that occur later than reactivation of AR.