CAD Operators perform two functions. In the First Contact (FC) role (also known as call receipt), they answer 999 and non-emergency telephone calls to police and enter the details of the call onto the MPS computer system. In the Despatch role they read the details of the calls as entered by First Contact, decide on the appropriate action to take, and, when police deployment is necessary, assign police officers using Airwave radios or by sending information directly to the MDT terminal of police vehicles. Most CAD Operators rotate between the two roles, but some are dedicated to one or the other.