Busy-on-Busy limits the calls to a group.
A maximum number of connections can be configured from which the group members can no longer be reached. Another caller then hears the busy tone. Call forwardings and multi-path call forwardings are still possible.
If the announcement before answering is enabled, the number of transferred calls through the waiting loop must be limited via Busy-on-Busy so that there are no more callers on hold than can be handled.
Configuring Busy-on-Busy seperately for groups.
Groups > Telephone Number > > Reachability
Configuring Busy-on-Busy configuration-dependent/time-controlled.
Groups > Profiles > > Reachability