If you are in sales or a role where you get on a call with more people than usual then pick a time of the day instead of whenever the prospect or the client wants. Like you can do all your calls between 11-2pm.

For everyone else, stop having calls at random times of the day. Pick a day of the week where you only do calls. It might be exhausting for introverts but they can keep some time later in the evening or next day for recovery.

The only better thing you can do is, having no calls.
Which one of these is for you?