Which mechanism allows a user to access their own extension settings from any registered IP phone?

• A. Hot Desking
• B. Extension Mobility
• C. Unified Messaging
• D. Call Park

Answer: (B)

Extension Mobility lets a user log into any registered IP phone and have their own extension number, line keys, speed dials, and voicemail settings applied to that device for the duration of the session. When the user authenticates on a phone, CUCM pushes the user’s DN and feature configuration to that device, so calls come in and behave as if the user were on their own phone, no matter which physical phone they’re using. This supports hot-desking, where people can move around and still appear to callers as using their own extension. Other options cover different capabilities: hot desking is the broader idea of sharing phones; Unified Messaging relates to voicemail integration; Call Park is about holding a call for later pickup.