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Acronyms and Definitions

DTMF

Dual Tone Multi-Frequency . These are the tones produced by your touch dial telephone when dialling numbers (as opposed to the sequences of clicks that were used in the days of pulse dialling, and is still found on some very old telephones). Interactive telephone menus are able to work because of the fact that DTMF frequencies are standardised - a pair of frequencies is uniquely linked to a number (or # or *) on the telephone keypad. The 'dual tone' part of DTMF refers to the fact that each key-press produces two frequencies depending on the row and column of the key.

e164

e164 offers a method of using your current telephone number as a means of being contacted in the IP world. Your telephone number gets mapped into a DNS zone, and the zone can contain your contact information (VoIP, instant messenger, email, anything). See e164.org for further details.

FXO

Foreign Exchange Office . The FXO port is what the cord in the back of your telephone comes out of (on the telephone side). Your phone provides an FXO interface to the telephone network.

FXS

Foreign Exchange Subscriber . Subscriber equipment (ie., telephones) plug into FXS ports. For example, the telephone port in the wall, is an FXS port.