User`s manual

Appendix A - Glossary User’s Manual (SIP/MGCP Version)
AT-VP504E FXS 16
CC Acronym for Country Code.
1. 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.
2. In international record carrier transmissions, a code
consisting of 2- or 3-letter abbreviations of the country
names, or 2- or 3-digit numbers that represent the country
names, that follow the geographical place names.
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).
IP Acronym for Internet Protocol. The IP protocol is a standard describing
software that keeps track of the Internet’s addresses for different
nodes, routes outgoing messages, and recognises incoming
messages.