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G
| Word |
Explanation |
| G.711 |
Providing a bandwidth of 300-3400 Hz, this ITU-TSS protocol is the underlying principle of video conferencing systems. Released in 1972, G.711 uses 56 Kbps and 64 Kbps data rates.
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| G.723.1 |
Transmitting audio signals at 5.3 Kbps and 6.3 Kbps in 30 millisecond streams, G.723.1 forms the basis for several IP telephony systems but is unsuitable for transmitting Fax tones, DTMF or music.
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| G.726 |
This codec based on ADPCM functions at speech compression rates of 16-40 Kbps, with 32 Kbps being most frequently used.
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| G.7xx |
A set of audio compression standards such as G.728 and G.729 belonging to the ITU family. ITU stands for the International Telecommunications Union, a body based in Geneva, which is one of the two bodies that set the standards for VoIP.
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| Gatekeeper |
A gatekeeper functions as the central control room of networks running VoIP, FoIP and other multimedia applications. Gatekeepers are involved in call authentication, managing call bandwidth, load balancing, interfacing with exiting enterprise systems, resolving IP addresses, logging call details and other monitoring activities related to network communication. Though a gatekeeper requires the regular routing devices, it does not participate in routing data packets.
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| Gateway |
A VoIP call is transmitted over an IP network whereas a call made from a traditional phone is transmitted over the PSTN (Public System Telephone Network). VoIP calls are also made to traditional phone devices and vice versa. Subsequently, at some point a VoIP data packet from an IP network has to be converted to a PSTN data packet. A VoIP gateway is responsible for this conversion. Essentially, VoIP gateways are devices that serve as an interface between the IP network and the PSTN. Their functionality includes call routing and controlling data packets and signals from both types of networks.
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| Grace Period |
it is the call time that is not billed. It appears at the beginning of the call and is measured in seconds.
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