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Term Definition
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.726 An ITU-T ADPCM wave form codec (16/24/32/40 kbps, good quality, low 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).
Gateway In IP telephony, a network device that converts voice and fax calls, in real time, between the public switched telephone network (PSTN) and an IP network. The primary functions of an IP gateway include voice and fax compression/ decompression, packetization, call routing, and control signaling. Additional features may include interfaces to external controllers, such as Gatekeepers or Softswitches, billing systems, and network management systems.