No one calls customer support to chit chat. They call because they have a problem and are likely irritated enough to get on the phone and ask about it. Odds are they’re not alone, so there’s a bit of a wait before your team can answer. If you were answering support calls, what would you want your frustrated customer listening to in the moments before you pick up?
The information to include on your on-hold message varies depending what services you provide. A good starting point is to record the information you think a customer would need to know about your business, such as: Hours of Operation Location Services Provided Products in Stock Current promotions and offers

Website: https://www.snaprecordings.com/blog/message-on-hold-benefits-for-business-phone-systems
Did you know that well-designed on-hold messages with pleasant, enjoyable, smiling narration, have the power to make your callers feel more confident about retaining your services? It also increases their trust in your company. It's tricky, but the reverse is really true. An unpleasant delay provides your callers with a great opportunity to judge your facilities and customer service.