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 companies consisting of 24 channels. E1 The European counterpart to Havertown broadband search, Havertown, PA search broadband HavertownHavertown search, broadband Pennsylvania, Havertown broadband search
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