Cisco Systems - OL-8356-01
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CHAPTER 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 p ...