---
title: "Cisco 88XX - Key Expansion Module"
slug: "cisco-88xx-key-expansion-module"
tags: ["calltower", "public"]
updated: 2026-09-18T14:27:57Z
published: 2026-09-18T14:27:57Z
canonical: "learn.calltower.com/cisco-88xx-key-expansion-module"
---

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

# Cisco 88XX - Key Expansion Module

## Goal

The purpose of this article is to provide information on the Expansion Module (Side Car) and how it may help your business needs.

![1.jpg](https://cdn.us.document360.io/4662144b-ab1f-4796-8b7b-e9f9c609894f/Images/Documentation/1(4).jpg?sv=2026-02-06&spr=https&st=2026-11-04T22%3A53%3A34Z&se=2026-11-04T23%3A53%3A34Z&sr=c&sp=r&sig=0ZLMCIV12wR1lYDuwj3tTShhTbXvSI59bGvlz6MTHjA%3D)

> [!NOTE]
> Note:
> 
> Expansion modules receive power from the phone but may require a power supply if using multiple expansion modules at a time.

![clipboard_e92a5c7d127336ac44c21af1fcec66c02.png](https://cdn.us.document360.io/4662144b-ab1f-4796-8b7b-e9f9c609894f/Images/Documentation/clipboard_e92a5c7d127336ac44c21af1fcec66c02.png?sv=2026-02-06&spr=https&st=2026-11-04T22%3A53%3A34Z&se=2026-11-04T23%3A53%3A34Z&sr=c&sp=r&sig=0ZLMCIV12wR1lYDuwj3tTShhTbXvSI59bGvlz6MTHjA%3D)

### Related Articles

[Cisco - Phone: Change Ringtone on 8800 Series Phones](/v1/docs/cisco-88xx-change-ringtone) [Cisco - Phone: 8800 Series Quick Start Guide](/v1/docs/cisco-88xx-quick-start-guide) [Cisco - Phone: Cisco IP Phone 8861 Enhance Experiences with Personal Mobile Devices](/v1/docs/cisco-88xx-ip-phone-experiences-with-personal-mobile-devices) [Cisco - Phone: Troubleshoot 8811 VPN Enabled Phone](/v1/docs/cisco-88xx-troubleshooting-vpn-enabled-phone) [Cisco - Phone: 88XX Series Factory Reset Procedure](/v1/docs/cisco-88xx-factory-reset-procedure) [Cisco - Phone: 8811 Quick Reference Guide](/v1/docs/cisco-88xx-8811-quick-reference-guide)