Auerswald COMpact 4000 Operation Manual page 318

Functions
Busy-on-Busy
Switching Busy-on-Busy On/Off
The Busy-on-Busy and Ann. before answering functions can work hand-
in-hand: If the function Ann. before answering On busy or Always is
enabled, it may be necessary to limit the number of callers that are automat-
ically put on hold in the waiting loop. To do this, the Busy-on -Busy function
can be enabled for a certain number of connections. If, for example, two
telephones are logged into the corresponding group and both are in a call, a
maximum of four callers will be put into the waiting loop if the limit is six.
Callers not put on hold in the waiting loop due to the Busy-on-Busy
restriction will directly hear the busy signal instead of the announcement for
announcement before answering. This prevents more callers being on hold
than can be accepted within a reasonable time.
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COMpact 4000 - Firmware V6.6A - Installation, Operation and Configuration V03 03/2016