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For one to fully understand the Voice Over Internet Protocol technology here is a glossary of VoIP-related terms.Analog TelephoneThe traditional telephone that transmits audio data through a telephone line is called analog telephone. The voice data it produces is called the analog audio signal.Analog Telephone Adapter/Adaptor (ATA)ATA is the hardware device that enables a traditional analog phone to be used as a VoIP phone by connecting it to a computer with Internet connection.BandwidthBandwidth is the quantity of data that can be transmitted over a communication line in a certain period of time.