Appendix B - Glossary User’s Manual (SIP Version)
Mediatrix 1104
24
Country Code (CC) In international direct telephone dialing, a code that consists of 1-, 2-,
or 3-digit numbers in which the first digit designates the region and
succeeding digits, if any, designate the country.
Dual-Tone Multi-
Frequency (DTMF)
In telephone systems, multi-frequency signaling in which a standard
set combinations of two specific voice band frequencies, one from a
group of four low frequencies and the other from a group of four higher
frequencies, are used. Although some military telephones have 16
keys, telephones using DTMF usually have 12 keys. Each key
corresponds to a different pair of frequencies. Each pair of frequencies
corresponds to one of the ten decimal digits, or to the symbol “#” or “*”,
the “*” being reserved for special purposes.
Dynamic Host
Configuration
Protocol (DHCP)
TCP/IP protocol that enables PCs and workstations to get temporary
or permanent IP addresses (out of a pool) from centrally-administered
servers.
Flash-Hook Quickly depressing and releasing the plunger in or the actual handset-
cradle to create a signal to a PBX or Centrex that special instructions
will follow such as transferring the call to another extension.
FXS Line Foreign Exchange Service/Station. A network-provided service in
which a telephone in a given local exchange area is connected, via a
private line, to a central office in another, i.e., “foreign”, exchange,
rather than the local exchange area’s central office. A FXS line is
normally connected to a standard telephone, fax or modem.
Gateway A device that links two different types of networks that use different
protocols (for example, between the packet network and the Public
Switched Telephone Network).
Internet Protocol (IP) The IP protocol is a standard describing software that keeps track of
the Internet’s addresses for different nodes, routes outgoing
messages, and recognizes incoming messages.
Light Emitting Diode
(LED)
A semiconductor diode that emits light when a current is passed
through it.
Local Area Network
(LAN)
Data-only communications network confined to a limited geographic
area, with moderate to high data rates. Contrasts with WAN.
Network A group of two or more computer systems that are linked.
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