In the restaurant industry, radios are only used for three things in most establishments. 1: Drive Thru and QA. 2: Paging for customer alerting devices, and vocal alerting purposes. 3: Internal Administrative purposes. Only other Food Service radio needs is for catering type services, and larger commercial delivery services. For fast food places, its 99% 1!
Example: Hardee's/Carl's Jr./Red Burrito - We had three belt packs with headsets in use most of the time. 2 Ch. operations. CH 1 was primary Drive Thru, and was monitored by the window person, and Team leader, sometimes also the Manager. This was not only to serve the patrons on wheels, but also for Quality Assurance so that an second person monitored the order to make sure it was right, and that person could back up the order taker. CH 2 was Administrative, and only used for communication between the Team Leader and Managers. There were a few times when they used it for "discussions" about customer manners etc.. Or to correct an order that was getting FUBAR'ed.