VoIP Terms

Analogue Telephone Adapter (ATA)

A device used to connect a standard telephone to a high-speed cable modem to facilitate VoIP and/or fax calls over the Internet

G.711

An ITU-T PCM half-duplex codec that uses either A-law or ?-law compression (64 kbps, high quality, minimum processor load)

Session Initiation Protocol (SIP)

A signaling protocol for Internet conferencing, telephony, presence, events notification and instant messaging

CODEC (Compress/Decompress)

A software component that compresses an audio or video file

Latency

Another term for delay. The amount of time it takes a data packet to get from point A to point B. The speed and capacity of a network are defined by both latency and bandwidth. Latency can have negative effects on VoIP calls when it gets too high.

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United States VoIP Subscriber Breakdown

• Company
• 2005
• 2004
• Growth

• Vonage
• 1.24 million
• 390,000
• 218%

• Time Warner
• 1.1 million
• 220,000
• 400%

• Cablevision
• 734,000
• 273,000
• 169%

• Comcast
• 202,000
• -
• -

• 8x8
• 113,000
• 40,000
• 183%