Busy-on-Busy limits the calls to a group.

A maximum number of connection 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 calls transferred through the waiting loop using Busy-on-Busy so that not more callers are in the waiting loop than can be handled.