MGCP
MOS

MGCP (Media Gateway Control Protocol)
protocol complementary to H.323 and SIP, designed to control media gateways from external call control elements in decomposed gateway architectures. MGCP is meant to simplify standards for the new Voice over Packet technology by eliminating the need for complex, processor-intense IP telephony devices, thus simplifying and lowering the cost of these terminals.


MOS (Mean Opinion Score)
A subjective measure of sound quality from 1 to 5. . It is a way to evaluate the quality of codecs or phone calls.