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 T1 which transmits at 2.048 Mbps TAPI Telephony API A programming interface that allows Windows client
