Dear jdamason
Do you use the new fixed network telephony (All IP) with an HD phone? Online you can find an overview of the functionality and operation of the Swisscom HD telephones:
https://www.swisscom.ch/en/residential/help/loesung/ip-telephony.html
Please note your telephone does not display the names of callers who have suppressed your telephone number or who have deactivated caller ID for your name. It also does not display the names of people who are not listed in the publicly accessible directory service provided by Swisscom Directories.
In case you need help or technical support, here you can find step by step instructions, software and further information about all your Swisscom devices: https://www.swisscom.ch/en/residential/help/device.html.
Kind regards