You call into a business. While you wait to get to the right person, you listen to music, information about the company and its promotions, or maybe even a recording that reminds you that your call is important to them. Most business-class phone systems come with a library of pre-recorded on-hold messages or music for you to choose from.
Before the digital era, he says more than 80 percent of business lines had voice mail. Now, he estimates only a third of office phones have it.”For customers, even the most professional voicemail greeting is impersonal, and may even harm customer experience (millennials, in particular, avoid using voicemail altogether).

“Hello, you’ve reached the Marketing Department at [XYZ Company]. All of our team members are currently working with other clients to [insert goal] and are unable to take your call.
In certain situations, it’s a good idea to let a call go to voicemail. If you’re in a loud area, unable to spend 10-15 minutes talking, or are otherwise distracted, don’t answer. Recruiters who cold-call candidates will understand that you’re simply unavailable – but make sure to return calls in a timely manner. If possible, call back during regular business hours.