
FXO
FXS
Glossary
Foreign Exchange Office. An FXO interface connects to the public switched telephone network (PSTN) central office and is the interface offered on a standard telephone. Cisco FXO interface is an
Foreign Exchange Station. An FXS interface connects directly to a standard telephone and supplies ring, voltage, and dial tone. Cisco's FXS interface is an
G
G.711 | Describes the |
| format for digital voice delivery in the PSTN or through PBXs. Described in the |
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G.723.1 | Describes a compression technique that can be used for compressing speech or audio signal |
| components at a very low bit rate as part of the H.324 family of standards. This Codec has two bit |
| rates associated with it: 5.3 and 6.3 kbps. The higher bit rate is based on |
| provides a somewhat higher quality of sound. The lower bit rate is based on CELP and provides |
| system designers with additional flexibility. Described in the |
| recommendations. |
G.729A | Describes CELP compression where voice is coded into |
| this standard (G.729 and G.729 Annex A) that differ mainly in computational complexity; both |
| provide speech quality similar to |
| recommendations. |
gateway | A gateway allows SIP or H.323 terminals to communicate with terminals configured to other protocols |
| by converting protocols. A gateway is the point where a |
| repackaged into IP packets. |
H
H.245 | An ITU standard that governs H.245 endpoint control. |
H.323 | H.323 allows dissimilar communication devices to communicate with each other by using a standard |
| communication protocol. H.323 defines a common set of CODECs, call setup and negotiating |
| procedures, and basic data transport methods. |
I
ICMP | Internet Control Message Protocol |
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SIP)
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