One of the most challenging aspects of writing for speech is optimising text to be read aloud and recorded. On paper, long, complex sentences are easily accommodated. When read out aloud, the same sentences can sound awkward and confusing.
Professional business voicemail greetings are significantly different from ones you record for individual use and complete your professional business image. They’re more generic in nature and designed to provide information to the caller while ensuring they leave a message. Where possible, explain when you expect to return calls. Typically, they’re recorded for the following:

On hold messages can be recorded for many purposes, such as promoting your business, answering FAQs or announcing important customer service information. It's important to be clear in the message you are trying to get across. Confusion leads to disengagement and reflects badly on the brand. Determining your callers' wait times is necessary to determine the required length of the on-hold message. Making the recording too short can lead to the message being played too many times. This can be repetitive and lose the caller's attention while they hold.
3.) Your contact person is still employed with other customer. To avoid long waiting times your welcome to leave your request and your contact information. We will contact you during office hours immediately. Many Thanks!