Cisco Ip Phone 8800 Series Multiplatform Phones Administration Guide - Cisco 8851 Administration Manual

Network Standard
DHCP option 15
DHCP option 41
DHCP option 42
DHCP option 43
DHCP option 56
DHCP option 60
DHCP option 66
DHCP option 125
DHCP option 150
DHCP option 159
DHCP option 160
Configure the Challenge for the SIP INVITE Messages
The phone can challenge the SIP INVITE (initial) message in a session. The challenge restricts the SIP servers
that are permitted to interact with the devices on a service provider network. This practice significantly
increases the security of the VoIP network through prevention of malicious attacks against the device.
Procedure
Step 1 In the phone web user interface, navigate to Admin Login > advanced > Voice > Ext(n), where n is an
extension number.
Step 2 In the SIP Settings section, choose Yes from the Auth INVITE drop-down list box.
Step 3 Click Submit All Changes.
Description
Domain name
IP address lease time
NTP server
Vendor-specific information
Can be used for TR.69 Auto Configurations Server (ACS) discovery.
NTP server
NTP server configuration with IPv6
Vendor class identifier
TFTP server name
Vendor-identifying vendor-specific information
Can be used for TR.69 Auto Configurations Server (ACS) discovery.
TFTP server
Provisioning server IP
Provisioning URL

Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide

Security Features
123