VoIP handsets require two things. A connection to the internet, via a network cable or network switch going into your broadband router.
Followed by some configuration details that must be inputted into your router / firewall. These settings allow the VoIP traffic to travel through your router / firewall correctly and not cause any problems with the call quality or functionality of your handsets, mobile apps or desktop apps.
To find out more information about these settings please contact support@ice-comms.co.uk or 03332025000.