One way to identify your pain points can be as simple as meeting with your team to discuss what makes their day — and the customer’s day — harder. By anticipating what your customers are struggling to find on their own, you can potentially solve their problems before they leave a voicemail or, at the very least, point them in the right direction. This will help ease your own pain by making the experience easier for the client to navigate, leading to a more organized process.
Even in today's fast-paced world, customers don't like being greeted with an automated message. According to the New York Times, callers of a certain age are put off entirely if they are answered by a voicemail instead of a real person.

“Good afternoon. You have reached the office of [your name]. I will be out of the office beginning on [date] and will be returning on [date]. Please leave a brief message with your contact information, and I’ll be sure to get back to you as soon as I return on [date]. If this is an emergency or you need to speak with someone before I return, please contact [name of colleague/supervisor], [their job title], at [their phone number].”
If you find that your business voice message is running a bit long, break it down into sections and decide which parts you can cut out to reduce the message’s length.