Much like traditional PBX systems, FreePBX uses extensions to route calls to individual users. Each person utilizing the PBX will typically be assigned a single extension. Users can dial an extension to other users directly. Extensions can have voicemail boxes associated with them. They can be members of either ring groups or call queues, or can be targets for direct inbound calls.
Rather than having an extension associated with a particular telephone, FreePBX separates the actual telephones into a concept called devices. An extension may be mapped directly to a device in the traditional style, or a device may be independent of an extension and the extension that rings the phone may change based on who is using it. FreePBX supports both of these methodologies.
In this chapter, we will discuss:
Operational modes for extensions
Endpoint types
Common fields
Setting up a new extension in Extensions mode
Setting up a new extension in DeviceAndUser mode
Voicemail...