Exion One is free of charge and it can be used with your existing Exion One account.
Features:
-Easy configuration via QR CODE
- Mute call
-Call history
-Call waiting
-Call over the Internet using SIP protocol
-DTMF
To set up ExionOne and make calls you need an Exions account SIP
Terms of use: https://exion.ch/it/termini-e-condizioni