busy tone
21all trunks busy — (ATB) A single tone that is interrupted at 60 ipm rate to indicate a condition when all trunks in a particular group are engaged …
22BTMA — Busy Tone Multiple Access …
23BTMA — Busy Tone Multiple Access …
24GE Marc V — Listen filename=Simulated GE Mark V Call.ogg title=GE Marc V description=Hear a simulated GE Marc V call as it would sound from a mobile, (version 2). format=OggGE Marc V is a historic U.S. format or protocol of trunked, two way radio introduced… …
25Telephone call — A telephone call is a connection over a telephone network between the calling party and the called party. Information transmissionA telephone call may carry ordinary voice transmission using a telephone, data transmission when the calling party… …
26Automatic callback — In telecommunication, an automatic callback is a computer telephony calling feature that permits a user, when encountering a busy condition or other condition where the called individual is unavailable, to instruct the system to retain the called …
27Panel switch — The panel switching system was an early type of automatic telephone exchange, first put into urban service by the Bell System in the 1920s and removed during the 1970s. The Panel and Rotary systems were developed in parallel by Bell Labs before… …
28Presence information — In computer and telecommunications networks, presence information is a status indicator that conveys ability and willingness of a potential communication partner for example a user to communicate. A user s client provides presence information… …
29Number Five Crossbar Switching System — The Number Five Crossbar Switching System or 5XB switch, designed by Bell Labs and made by Western Electric, was in use in Bell System telephone exchanges from 1948 to the 1980s. Its principal use was as a Class 5 telephone switch, though… …
30Hörtöne — Dieser Artikel oder Absatz stellt die Situation in Deutschland dar. Hilf mit, die Situation in anderen Ländern zu schildern. Hörtöne sind Signaltöne, die im Telefonhörer oder über den Lautsprecher eines Endgerätes zu hören sind. In Taktung,… …
