To get voicemail messages to their intended recipients faster, many speech-to-text providers now offer voicemail transcription services. Nuance is one such company, and Dan Faulkner, its senior vice president of mobile, says the service is widely popular. "We find that the voicemail-to-text service is incredibly sticky," he said in a recent interview with Speech Technology magazine. "When people get it, they don't listen to voicemails anymore."
Listen to your messages and return your calls as soon as possible. Of all the lines of communication available (social media, text, email, etc.,) your callers resulted in picking up the phone to call you because they wanted to speak with a live person. Do them the common courtesy and give them a call back when you first have the chance.

Check out Webex Community, where experts and other members help answer questions every day. You can see if others have the same question, or make a new post about your specific issue.
You can customize each greeting for each phone number within your OpenPhone account. In addition, you can change it as often as you need.