The difference between the Gigaset E 720 CH version landline phone and the Gigaset E 720 could be regional adaptations or specific functions for the Swiss market. However, there is no specific information on whether the features or functions are different. The Gigaset E 720 models usually offer similar functions such as call barring, call hold and call forwarding. For detailed information on the CH version, it would be advisable to consult the official Gigaset website.