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CHAPTER

9-1

Cisco CallManager Security Guide

OL-8356-01

Phone Hardening

To tighten security on the phone, you can perform tasks in the Phone Configuration window in

Cisco CallManager Administration. This chapter contains information on the following topics:

• Disabling the Gratuitous ARP Setting, page 9-1

• Disabling Web Access Setting, page 9-1

• Disabling the PC Voice VLAN Access Setting, page 9-2

• Disabling the Setting Access Setting, page 9-2

• Disabling the PC Port Setting, page 9-2

• Configuring Phone Hardening, page 9-3

• Where to Find More Information, page 9-3

Disabling the Gratuitous ARP Setting

By default, Cisco IP Phones accept Gratuitous ARP packets. Gratuitous ARP packets, which devices

use, announce the presence of the device on the network. However, attackers can use these packets to

spoof a valid network device; for example, an attacker could send out a packet that claims to be the

default router. If you choose to do so, you can disable Gratuitous ARP in the Phone Configuration

window of Cisco CallManager Administration.

Note Disabling this functionality does not prevent the phone from identifying its default router.

Disabling Web Access Setting

Disabling the web server functionality for the phone blocks access to the phone internal web pages,

which provide statistics and configuration information. Features, such as Cisco Quality Report Tool, do

not function properly without access to the phone web pages. Disabling the web server also affects any

serviceability application, such as CiscoWorks, that relies on web access.

To determine whether the web services are disabled, the phone parses a parameter in the configuration

file that indicates whether the services are disabled or enabled. If the web services are disabled, the

phone does not open the HTTP port 80 for monitoring purposes and blocks access to the phone internal

web pages.

1 2 3 4

Inhaltsverzeichnis

Seite 1 - Phone Hardening

CHAPTER 9-1Cisco CallManager Security GuideOL-8356-019Phone HardeningTo tighten security on the phone, you can perform tasks in the Phone Configuratio

Seite 2 - Disabling the PC Port Setting

9-2Cisco CallManager Security GuideOL-8356-01Chapter 9 Phone Hardening Disabling the PC Voice VLAN Access SettingDisabling the PC Voice VLAN Ac

Seite 3 - Configuring Phone Hardening

9-3Cisco CallManager Security GuideOL-8356-01Chapter 9 Phone Hardening Configuring Phone HardeningConfiguring Phone HardeningCaution The follow

Seite 4 - Related Cisco Documentation

9-4Cisco CallManager Security GuideOL-8356-01Chapter 9 Phone Hardening Where to Find More InformationRelated Cisco DocumentationCisco IP Phone

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