To enable the queue monitoring, open the OPC panel settings and open the Queues tab. Type your number in the textbox and click Add. It will appear in the table below.
If you want to put a call in the queue when you are busy, you can configure a rule or an advanced rule with call forward to your queue number. If you don't know which is your queue number, please ask to your system administrator.
When your headphone is hooked you receive a call from the number in queue.
The numbers in queue are displayed on the right border of the screen, in a panel like the following one:
If you don't see it, try to click on Show queues and/or enable queue
monitoring.
In the example next call for Luca will be from Federico. You can change the call priority selecting the icon
To put the active call in queue, drag and drop the user box relevant to yourself in the queue panel.