Pager Technology
How do pagers work?
When the guest wants to call a waiter, he/she can press down the pager button. The host screen will voice broadcast and display the call number, from it, the waiter is able to know which/where the guest needs help, then he could go to the table immediately(avoid that this waiter going around in the restaurant), which can create a more comfortable situation for the guests.
Like the following pictures: