If you can't talk to me just let my call go to voicemail.
I'm talking primarily about personal calls. I'd much rather leave a message and be called back later when there is time to talk rather than be told that my call isn't important enough!!
On the other side and from a different angle I'm a HCP and people answering their phone during consultations is a real bugbear. It happens multiple times a day.
Put your phone on silent and if you forget do so when it rings. Don't answer it to tell the caller that you are seeing the HCP and can't talk.
I get