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 applications to access voice services on a server. 802.1p An IEEE standard for providing QoS using three bits (defined in 802.1q)
