By default, the global busy prompt and global unavailable prompt are applied to all extensions. If an extension user wants to use her/his personal greetings, you can change the prompts for the extension.
Hello, you have reached the dental office of Dr. X. We are busy assisting a patient now, but will call you back as soon as possible. Please leave your name, reason for calling, and your number. If this is an urgent enquiry, please call 911. In this case, the dentist is giving a reason for not being available and they’re providing a way to prioritize the patients who need the most help. They’re also leaving an emergency number for the most severe of situations.

What you need to record creative and funny voicemail greetings. Creative voicemail greetings are a terrific engagement and personalization tool for business. But to make them work, you need a business phone system that makes recording, tweaking, and uploading voicemail greetings simple. MightyCall provides such an answer for businesses.
The extension users may want to make their voicemails more personalized and professional depending on presence, you can set personalized voicemail greetings for each user. Upload an extension voicemail greeting Log in to PBX management portal, go to Extension and Trunk > Extension, edit the desired extension. Click Voicemail tab. In the Voicemail Greeting section, click Greeting Management. In the pop-up window, click Upload. Select an audio file to upload.