VoIP calls – Protect your VoIP device and services
VoIP terminals include fixed telephone equipmentdevices, software used on a mobile phone or computer and traditional fixed-line telephones that have been connected to a VoIP service with a separate adapter.
A VoIP terminal device has to be protected against misuse. If a terminal device is not adequately protected, criminals may use it unauthorised to transmit international calls or calls to expensive premium-rate service numbers.
A subscription that is misused may quickly cause its holder damages worth thousands of euros.
In addition to misuse, VoIP traffic involves the risk of eavesdropping. Eavesdropping is easiest when VoIP calls are made in a wireless network (e.g. an unencrypted WLAN).
You should protect your VoIP terminal device with a firewall. The easiest way to do that is to use the device's own firewall. If you use VoIP software on your computer, the computer's own firewall is efficient. In the settings of the firewall, only allow VoIP connections to the servers of your service provider.
In addition to using a firewall, you have to keep the software of the VoIP terminal device and/or VoIP software up-to-date. Check regularly whether new updates are available. You can do that by visiting the device or software manufacturer's website or by using automatic updates.
Remember to change the default password of the VoIP service immediately when you start using the service.
Ask your service provider about barring services and other limitations available.
If you receive an unusually large invoice or believe you have fallen victim of unauthorised use, contact your service provider's customer service immediately.