You only need to type “voice over IP security” into Google and find the millions of results to realise the depth of the fear. Malicious damage to your business through business interruption, virus or denial of service (DoS) attacks, criminal activity, telephony fraud or theft of information are all genuine concerns.

To read more of this Computing UK story see www.computing.co.uk/computing/analysis/2217608/voip-application-worth-paying-4021945.