What are 'Extensions' used for in 3CX?

'Extensions' in 3CX serve as internal phone numbers specifically allocated for individual users or devices within the system. Each extension functions as a distinct identifier that enables direct communication between team members or connects calls to specific devices, such as desk phones, softphones, or mobile applications. This feature supports internal dialing, call forwarding, and various telephony functionalities, creating a seamless communication environment within an organization.

Assigning extensions allows users to easily connect with each other using a short number rather than needing to remember long phone numbers. Furthermore, each extension can be customized with its own settings, such as voicemail, call routing, and call handling preferences, enhancing user control and functionality.

The other options relate to different configurations or monitoring features outside the core purpose of extensions. For instance, IP addresses, network settings, and call quality monitoring are essential aspects of the overall system setup and maintenance but do not directly pertain to how extensions are utilized for user communication within 3CX.