1. A system for enhanced extension mobility, the system comprising one or more processing units collectively operable to: access user input indicating a desire of the user to logon at a telephone in a shared mode according to which the telephone concurrently supports a telephone extension of the user and one or more other telephone extensions of one or more other users; and in response to the user input indicating a desire of the user to logon at the telephone in a shared mode according to which the telephone concurrently supports the telephone extension of the user and one or more other telephone extensions of one or more other users, configure the telephone to concurrently support the telephone extension of the user and one or more other telephone extensions of one or more other users.