State of knowledge

February 2025

In ProCall Enterprise, you can configure the settings for "Reject calls when busy" in the Settings – Telephony – Call protection section. Information on this can be found in the context-sensitive estos ProCall Enterprise Client Help (accessed via the F1 key) and under ProCall Enterprise Online Help.

Depending on the configuration of the telephone system, you can have second calls delivered on "Call waiting" and set Busy on Busy for one line or across all devices. 

Call state (alert state)

Incoming calls, incoming audio/video chats, or incoming screen sharing requests are not logged until the call or request is answered.


From when is the participant considered occupied?

The call protection Busy on Busy and cross-device Busy on Busy status is only activated:

  • for INBOUND calls:
    when the call or request has actually been accepted and a connection established.
  • for OUTBOUND calls:
    as soon as "DIALTONE/DIALING " is signalled on a TAPI line (e.g. lifting the handset) or INVITE on a softphone line (dialling process).

Only then the participant is considered to be busy for the purposes of call protection.