What is the difference between the emergency number 1 1 2 (one-one-two) and other emergency numbers such as 113 or 115?

The number 1 1 2 (one-one-two) collects all requests coming from pre-existing emergency numbers; therefore, by dialling 113 (Police) or 115 (Fire Brigade) or 118 (Health Service), the call will be redirected to the Single Emergency Number.