Allied Telesis AT-VP504E FXS (H.323) - Manual (Page 20)

Appendix A - Glossary Administration Manual (H.323 Version)
AT-VP504E FXS 16
In this context, the Area Code corresponds to the Z portion of the
numbering plan. Since virtually every country has a different dialing
plan nomenclature, it is recommended to identify the equivalent of an
Area Code for the location of your device.
C
Country Code (CC)
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.
D
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.