Extension Overview

An extension is a short internal number. Extensions allow users to make and receive calls. You can assign extensions to every employee in your organization.

Extension types

Yeastar P-Series PBX System supports two extension types:
SIP extension

A SIP extension is based on SIP protocol.

To use a SIP extension to make or receive calls, you need to register the extension on an IP phone or a softphone.

For more information, see Create a SIP Extension and Set up a SIP Phone.

FXS extension
An FXS extension is associated with an analog phone or a fax machine.
To use an FXS extension to make or receive calls, you need to connect an analog phone or a fax machine to PBX's FXS port, and assign an extension number to the analog phone or fax machine.
For more information, see Create an FXS Extension and Set up an Analog Phone.

Online status

Online status allows you to view status of phone endpoints and Linkus clients.
  • Phone endpoints
    • indicates that the SIP extension is registered and ready for use.

      Hover your mouse over to view the IP addresses of SIP phones where the extension is registered.

    • indicates that the FXS extension is assigned to an FXS port.
  • Linkus clients
    • indicates that Linkus Desktop Client is ready for use.
    • indicates that Linkus Mobile Client is ready for use.
    • indicates that Linkus Web Client is ready for use.