The Yealink WH 64 headset cannot be paired directly via DECT with a Swisscom Internet Box without using a base station or an IP phone. The headset is designed to be connected to a base station, which is then connected to the telephone or Internet Box.

For use with a Swisscom Internet Box, it is necessary to use a compatible base station or an IP telephone to establish the DECT connection. The headset itself requires a base station to effectively utilise DECT technology and enable the connection.