G
G.711
An ITU-T PCM half-duplex codec that uses either A-law or ?-law compression (64 kbps, high quality, minimum processor load).
G.723.1
An ITU-T double rate CELP codec (6.4/5.3 kbps, medium quality, high processor load).
G.728
An ITU-T low delay CELP codec (16 kbps, medium quality, very high processor load).
G.729
An ITU-T ACELP codec (8 kbps, medium quality, high processor load).
Gatekeeper
The central control entity that performs management functions in a Voice and Fax over IP network and for multimedia applications such as video conferencing. Gatekeepers provide intelligence for the network, including address resolution, authorization, and authentication services, the logging of Call Detail Records, and communications with network management systems. Gatekeepers control bandwidth, provide interfaces to existing legacy systems, and monitor the network for engineering purposes as well as for real-time network management and load balancing.
Gateway
In IP telephony, a network device that converts voice in real time, between the public switched telephone network (PSTN) and an IP network. The primary functions of an IP gateway are voice and fax compression / decompression, packetisation, call routing, and control signalling. Additional features may include interfaces to external controllers, such as gatekeepers or softswitches, billing systems, and network management systems.
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