‘Port Mirroring’ is a feature of an Ethernet/network switch that takes a copy of all network traffic seen on one or more ports connected to your VoIP handsets, soft-phone computers or mobile devices) and sends it to a specified port where the CallN Thin Client software can analyse and collect a copy of VoIP calls and securely upload them to your CallN account as recordings. Please see our Port Mirroring page for more detail.