Answering calls when call queue agents are unavailable or away

Hello,

You will need to create two Call Queues.
The first queue will just have the receptionist in it
Set a Timeout of 30 seconds and a maximum amount of callers to 2 (or however you like)
IF that timeout or maximum callers is reached, transfer the call to the second queue.
Add all remaining phones AND the receptionist into the second queue (in case the receptionist becomes available again) and set the routing style to 'Attendant'.
If the call is still not answered, you can choose to send it to voicemail or a mobile.

You can also add any other user into the first queue and allow users to opt out of receiving calls. That way if the receptionist is on leave, you can simply opt-in to taking calls from the first queue to avoid delays for the caller.

The other way you can achieve this without any 'advanced' routing is to add all users as a delegate to the receptionist. Set the receptionist's call settings to 'Also ring' 'My Delegates'
The other three users will see an incoming call with a banner above it saying 'Call for <name>'