Yes, paging is still relevant. Here's why:
Paging is great for car dealerships or multi-floor companies. Paging systems make it easier for a receptionist to announce a call. For car dealerships this allows the operator to announce a sales call is holding for an available sales rep. In the case of large or multi-floor businesses, the receptionist can park a call on hold and announce that _____ has a call holding on____. The paging system can work in conjunction with the park/hold feature of the phone system.