Check Dhcp Settings - Cisco 7821 Administration Manual

Troubleshooting Procedures
Related Topics
Basic Reset, on page 195
Determine Phone MAC Address, on page 45

Check DHCP Settings

Procedure
Step 1 On the Cisco IP Phone, press Applications.
Step 2 Select Admin Settings > Network Setup > IPv4 Setup, and look at the following options:
• DHCP Server: If you have assigned a static IP address to the phone, you do not need to enter a value
for the DHCP Server option. However, if you are using a DHCP server, this option must have a value.
If no value is found, check your IP routing and VLAN configuration. See the Troubleshooting Switch
Port and Interface Problems document, available at this URL:
http://www.cisco.com/en/US/customer/products/hw/switches/ps708/prod_tech_notes_list.html
• IP Address, Subnet Mask, Default Router: If you have assigned a static IP address to the phone, you
must manually enter settings for these options.
Step 3 If you are using DHCP, check the IP addresses that your DHCP server distributes.
See the Understanding and Troubleshooting DHCP in Catalyst Switch or Enterprise Networks document,
available at this URL:
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a00800f0804.shtml
Related Topics
Phone Cannot Connect to Server, on page 179
Phone Resets Due to DHCP Setting Errors, on page 181
Cisco IP Phone 7821, 7841, and 7861 Administration Guide for Cisco Unified Communications Manager 10.0
(SIP)
190