---
title: "Suggested Extension Ranges"
slug: "suggested-extension-ranges"
updated: 2025-07-23T20:46:34Z
published: 2025-07-23T20:46:34Z
canonical: "docs.ucstack.io/suggested-extension-ranges"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ucstack.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Suggested Extension Ranges

## For Regular Users

| Extension (Range) | Details |
| --- | --- |
| 100 - 79900 | Regular Users |
| 90000 - 99999 | System Extensions |

## For System Extensions

| Extension (Range) | Category | Details |
| --- | --- | --- |
| 80000 - 89999 | Reserved | To be determined |
| 90000 - 90999 | Auto Attendants |  |
| 91000 - 91999 | Conference Bridges |  |
| 92000 - 92999 | Call Parking | Static and Dynamic Parking |
| 93000 - 93499 | Queues | NON ACD - Ring All and Linear Hunt |
| 93500 - 93999 | Queues | ACD - Round Robin and Cascading |
| 94000 - 94999 | Hot Desking |  |
| 95000 - 95499 | Courtesy Phones |  |
| 95500 - 95699 | SIP Paging |  |
| 95700 - 95999 | Shared Line Appearances |  |
| 96200 - 96499 | PSTN forwarding |  |
| 96700 - 96799 | Special app Time Controls |  |
| 96800 - 97999 | Custom |  |
| 98000 - 98999 | Mailboxes |  |

Session Initiation Protocol, a signaling protocol used for initiating, maintaining, and terminating real-time sessions that include voice, video, and messaging applications.

Public Switched Telephone Network, the traditional circuit-switched telephone network that connects landline and mobile phones.