Do not be in a hurry while recording your voicemail. When recording your voicemail, it is important to speak slowly and clearly. It is also should be evident when you left the voicemail. Your voicemail should not appear to be a single gigantic word to the callers. Speak your words clearly and pause at the points you need to pause.
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.

Professional Phone Greetings, Voicemail & On-Hold Voice Overs When a customer calls your place of business, they generally expect to be placed on hold at some point. Rather than play annoying music, why not use this captive audience to promote your business with a professional voice over.
Sometimes it’s difficult to remember that customers don’t have the knowledge and expertise you and your colleagues have regarding your business. Again, the main idea behind a business voicemail greeting is to offer a clear, actionable message. If you’re using technical terms that make sense only to you and your colleagues, you’re going to alienate the customer rather than encourage him/her to leave a message.