In our "Cisco Unified CM Administration System version: 184.108.40.20600-2" installation, I have a CISCO IP Phone 7940 series with the number 1595.
In the "Multiple Call/Call Waiting Settings on Device SEP0014691B5534", I have configured the phone with:
Maximum Number of Calls: 2
Busy Trigger: 2
What I would like to archive is that I would like to see in the display if another user is calling me (even if I already have a call in progress), but if I already have a call in progress, I would like to have the second call to sound as busy when they call me.
Is this possible to configure, or have I misunderstood something what can and cannot be done?
You may set busy trigger to one. Then the 2nd call will get a busy. But you won't see the 2nd call coming in. Because the phone will only display the 2nd call when it's in "Ring-In-Progress" state.
Many people have enquired about this over the years
Sadly, (but understandably) this is an either/or situation. If you
want to be able to handle multiple incoming calls, then you need to set
the Busy trigger @ 2 (like you have done). If you want the second caller
to know that the person is already on an active call you usually set the Busy Trigger
@ 1 and indicate via your "on the phone" greeting that is available in most
current Voicemail systems.
You can't have it both ways here
Ps: if you are going to set the Busy trigger @ 2 you should bump
up the Max Calls to 4 to handle Transfers etc.