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Glossary

Zaptel

The Zaptel project has been renamed 'DAHDI' as of May 2008. DAHDI is a series of drivers for telephony hardware devices.
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VoIP

Voice Over Internet Protocol
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Transcode

The process of converting a channel with one type of encoding to a different type of encoding in real time.
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TDM

Time Division Multiplexing
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SIP

Session Initiation Protocol
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REN

Ringer Equivalency Number
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PSTN

Public Switched Telephone Network
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PRI

Primary Rate Interface
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PBX

Private Branch Exchange
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Open source

An approach to the design, development, and distribution of software, offering practical accessibility to a software's source code.
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MGCP

Media Gateway Control Protocol
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IVR

Interactive Voice Response
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IAX

Inter-Asterisk eXchange
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H.323

A VOIP protocol that was deployed early and is widely adopted.
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GSM

A compressed speech codec that uses a rate of 13 kbps.
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G.729

The G.729 codec is an industry standard which allows for stuffing more calls in limited bandwidth to utilize IP voice in more cost effective ways.
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G.711

An uncompressed codec that samples a 64kbps channel at 8 bits per sample using pulse code modulation.
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FXS

Foreign Exchange Station
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FXO

Foreign Exchange Office
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Encode

The process of converting an analog signal into a digital signal that can be manipulated easily by a computer.
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E&M

Ear & Mouth
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Dialplan

A dial plan establishes the expected number and pattern of digits for a telephone number.
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