A service feature that (a) enables a controlling telephone to place a call to a specified number of telephones simultaneously, (b) enables the call to be recorded, (c) if any of the called lines is busy, enables the equipment to camp on until the busy line is free, and (d) rings the free line and plays the recorded message .
GROUP ALERTING AND DISPATCHING SYSTEM
Meaning of GROUP ALERTING AND DISPATCHING SYSTEM in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012