We weren't even allowed to do that, in case family members (or whoever) found out that an NHS person had called. Clearly policies do differ somewhat, and it sounds like you have a more useful compromise ;-)
Most people screen their phone calls and often avoid answering unknown numbers. If you’re applying for new positions, you should try to view each unexpected call as an exciting opportunity! In the event that you simply can’t pick up the phone, you’ll want a polished voicemail greeting to let the caller know they’ve reached the right person.

31. Hi, this is [your name] at [your company]. If you are calling for [include reason] please visit our [website, social media handle, etc.], contact [name and title of colleague and phone number] or send me an email at [insert email address]. For other inquiries, leave a brief message and your name and number and I will call you back by [timeframe].
A dentist is similar to a doctor. Unlike a doctor, a dentist is going to get far more non-urgent calls as patients will want to know when they can pick up various orders, as well as to book follow-up appointments. The key here is prioritizing so the dentist can respond promptly to the patients who need emergency dental work and other urgent consultations.