Question to the Department for Science, Innovation & Technology:

To ask the Secretary of State for Science, Innovation and Technology, what data her Department holds on the number of silent calls received by emergency services on (a) ISDN and (b) SIP lines.

The Emergency Services are operationally independent and have responsibility for the operation of emergency service control rooms that process emergency calls, as overseen by local Chief Officer and relevant Lead Government Departments, including Departments in the Devolved Administrations as applicable.

The digital transition is industry led and the emergency services are being supported by their respective communications providers. DSIT is working closely with the lead government departments for the emergency services to provide advice on areas of risk which has prompted actions from the emergency services to increase resilience measures.

DSIT does not hold any data on the number of silent calls received by the emergency services.