Therapists don't need voice mail messages that demean their patients. I just called a psychotherapist colleague and listened to her voicemail greeting with the now-ubiquitous message, “If this is an emergency, hang up and call 911.” My professional voicemail will never include such a message.
What voice do you want to convey when speaking with customers? This may be professional, casual, or even humorous.

– Thank you for calling XYZ Company. We are currently unavailable to take your call. Our business hours are nine to five, Monday through Friday. If you know the extension number of the person you are trying to leave a message for, you may dial it now. Press 1 for sales. Press 2 for customer service. Press 3 for the billing department. Press 9 for a company directory, or hold on to leave a message for the operator. If this is an emergency, please enter 911 now to be connected with the after-hours support personnel.
Professional voicemails are important, because they’re an extension of your personal brand, reflecting what level of professionalism you offer. Use these voicemail greetings for work or personal cell phone messages for your specific needs. You can choose a voice that will best suit your business and will deliver a warm and professional voice message. Your callers don’t want to hear a cold and indifferent machine voice. The information you want to put in your voicemail should be succinct enough for your callers to get every bit of information they need. Leave the relevant information in a clear and precise manner. Professional voicemail greetings for work should be informative. The first message the customer hears should have the company’s name so they can be sure they’ve reached the right number. Be courteous and informative. This could be their first point of contact, and you want it to be enjoyable. You may also like 30 Best Wishes and Congratulations for New Business Adventures If you’re going to make your voicemail message humorous in some way, it should be tasteful and aligned to your brand. It shouldn’t get in the way of giving customers enough information when they call. Your voicemail greetings for work should be welcoming and friendly but not too informal. Customers want to feel confident that they’ve contacted a professional, that the company values their call, and they have made the right choice. So be friendly but not too nonchalant. Your voicemail greeting should be clear, concise and to-the-point. You don’t have to put your clients through a sales pitch when they are trying to just get some information.