1. Create a Sound Clip to direct callers through a call tree. It can be as simple as "Thank you for calling (Insert practice name), if you are a new patient press 1, if you are an existing patient press 2"
2. Add an Auto Attendant in the switchboard as the first thing a caller will hit during open hours. Do not connect "On Timeout" to anything- this will drop any unattended spam callers from reaching receptionists.
3. You can do the same for after hour auto attendants.
4. Increase Repeat times from 0 up to 1 or 2 so callers will make sure to select an option and not be disconnected.