Users connect to the Vodia PBX through extensions, and each extension can have multiple devices connected to it. These devices will ring in parallel when someone calls the extension, so a person can pick up the call on the device that suits him or her best. Each extension can have its own time zone, language, ringtone, address book and much, much more. Extensions may have administrative permissions; for example, for managing the central address book or for barging into calls. For each extension, working hours can be established and users can manually place them in do-not-disturb mode. There are many ways for redirecting calls.