The telephone only works with a Swisscom box if the box offers an analogue telephone connection, as the telephone is an analogue landline telephone.

The Panasonic KX-TGK220GB is an analogue landline telephone that is connected to an analogue telephone line. Although the Swisscom Internet Box mainly supports IP and DECT telephones, if it has an analogue connection (TAE or RJ11), the telephone can be connected there. A direct DECT connection to the Swisscom Box is not possible with this model as it is not a DECT telephone.

If the Swisscom Box only supports IP or DECT telephones, a separate analogue telephone line or an adapter is required. The KX-TGK220GB is compatible with analogue connections, not with IP-based telephone connections or proprietary DECT systems from Swisscom.