Many medium - larger sized companies purchase call forwarding services where the customer calling their business number is greeted and asked to select the department they would like to connect to using their number pad. Based on the number they press on their keypad, they are then forwarded to the relevant phone number. Example: "Welcome to Example Company! If you would like to speak to Sales, Press 1. If you would like to speak to the Billing team press 2... etc" I was unable to sell the phone number system because of this missing feature. In my experience, many companies, even some of the smaller ones use this feature as it helps them organise and direct their customers to the right person instead of having a receptionist.