For staff who are away from school, or work at different locations during the day, being able to forward calls to a mobile device is a must. Callers are not aware where the call is forwarded to. Additionally, desk phone users may prefer to hot-desk to another phone or device, therefore, retaining all their user settings e.g. voicemail, call history, Busy Lamp Field (BLF) information, etc. rather than simple call forwarding.