Recommendation 21

As with most digital programmes, the various elements of ESN need to work seamlessly together for ESN to work;70 This ‘systems integration’) is one of the main risks the Department needs to manage.71 For example, the push-to-talk technology needs to integrate with handsets for individuals and devices in vehicles and aircraft and the mobile network. Control rooms use an unknown number of other systems that link to Airwave and will therefore need upgrading. The Department does not know how many vendors provide these systems.72