First responders are life savers and providers of help in often dangerous situations. So it's easy to think of them as operating on their own or just with a partner.
In reality, the dispatch center communicating with a first responder connects them to a whole team of other individuals and systems that are critical to doing their job. When first responders speak to a dispatch center with their mobile or two-way radios, they're bringing a whole public safety team with them.
When police, emergency medical, and fire units communicate with each other, the various channels of communication technology need to be centralized so that a single trained professional can follow protocols and deploy the right resources to handle the specific emergency at hand.