Another option to try out is OpenPhone. We give small business owners a dedicated phone number (local or 1-800) on top of their current device with professional features to make their business look and sound great.
After creating, the Voicemail Greeting, you can test it by calling to your number from another phone, and see if it is playing correctly or not. Open the Phone App. On the lower screen, tap on the Voicemail option. Select Custom, with this option, you can record the personal voicemail greeting on the iPhone. Tap Record, to start recording the voicemail greeting message on the iPhone. Greeting samples are given in this article below, Once you are done with recording, tap Play to listen. Lastly, if everything is alright, and custom voicemail recording is perfect, then tap Save.

A word of warning: These greetings will not do you any favors if you're in the midst of a job hunt or work in a conservative industry. Always remember your target personas. If there's a chance they won't appreciate your sense of humor, opt for a straightforward greeting instead.
VirtualPBX provides every extension owner in your company with custom routing. If the employee isn’t available, the call will go to the personalized business voicemail account for that employee as a result. In this way, each employee can have a business greeting for callers. Similarly, you can set up voicemail boxes for departments or your company as a whole. Even if the call goes to a phone that already has personal voicemail, we can make sure your business calls only go to your business voicemail system. People that call the employee’s number directly get personal greetings, those that go through VirtualPBX get a business greeting.