voice telephone network. DNIS Dialed Number Identification Service A telephone function that sends the dialed telephone number to the answering service. SIP Session Initiation Protocol A protocol that provides telephony services similar to H.323, but is less complex and uses less resources. DTMF Dual-Tone Multifrequency The type of audio signals generated when you press the buttons on a touch-tone telephone T1 A 1.544-Mbps point-to-point dedicated digital circuit provided by the telephone
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