A telephony system (100) is disclosed as including a number of telephone sets (116a-116f), a home server (110), a fingerprint scanner (102), a keypad (104), a smart card reader (106), and such other identification devices which are adapted to detect the occurrence of location-related events relating to users of the system (100), and the home server (110) is adapted to assess, on the basis of occurrence of the location-related events, the respective probability of the users being in the vicinity of each of the telephone sets (116a-116f). There is also disclosed a method of operating a telephony system (100), including providing a number of telephone sets (116a-116f); providing a home server (110); detecting the occurrence of location-related events relating to users of the system (100 ); and assessing the respective probability of the users being in the vicinity of each of the telephone sets (116a-116f).