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Tele-Communication (Telecom) Terms Glossary and Dictionary
ABCD Tones
ABCD Tones are simply additional DTMF tones that may be used in any way the standard (0-9) tones are used. The ABCD Tones are used in the U.S. Military telephone network (Aoto Von), in some Automatic Call Distributor (ACD) systems, for control messages in some PBX systems, and in some amateur radio auto-patches.
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