War dialing can also miss modems in constant use, which staff may be using to connect to corporate networks from home, usually for perfectly legitimate reasons - they may have been built by IT support staff who may be called out at unsociable hours. Nevertheless, they may represent a security vulnerability and should be secured or removed, as appropriate.

To fill these gaps in modem detection and telecoms network traffic analysis, Context carries out a Telecoms Security Assessment service, using the unique Enterprise Telephony Management system. This is plugged in between the organisation's PBX and the telecoms carrier and left there to monitor call activity for a set period, usually a week, before analysis of the data gathered.

Visit the telecoms services page to learn more about the other technical and consultancy services we offer in relation to telecoms networks.