It's time for some inbound rules. We currently have four lines on the analog line that we can direct to specific extensions.
First, we give it a name. Then in the DID/DDI number/mask field, we can put a "*." This tells 3CX to use this for any call. Now we specify line 10003 in the for port identification field.
Next we tell it where to direct the call which, in this case, is extension 100. We want this to happen outside of our office hours, so we can check that box as well, as shown in the following screenshot: