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 Cloud PBX supports 3 types of extension:

SIP Extension

A SIP extension is based on SIP protocol.

To use a SIP extension, you need to enter the extension credentials on an IP phone or a softphone. After the extension is registered on a phone, you can make and receive calls.

Extension format

Yeastar Cloud PBX supports 1-digit to 7-digit extension format. The default extension format is 4-digit number.

Before you create extensions, you can go to Settings > PBX > General > Preferences > Extension Preferences > User Extension to change the extension format and range.