Troubleshooting Procedures; Check Tftp Settings; Determine Dns Or Connectivity Issues - Cisco 7821 Administration Manual

Troubleshooting Procedures

These procedures can be used to identify and correct problems.

Check TFTP Settings

Procedure
Step 1 You can determine the IP address of the TFTP server that the phone uses by pressing Applications, then
selecting Admin Settings > Network Setup > IPv4 Setup > TFTP Server 1.
Step 2 If you have assigned a static IP address to the phone, you must manually enter a setting for the TFTP Server
1 option.
Step 3 If you are using DHCP, the phone obtains the address for the TFTP server from the DHCP server. Check that
the IP address is configured in Option 150.
Step 4 You can also enable the phone to use an alternate TFTP server. Such a setting is particularly useful if the
phone recently moved from one location to another.
Step 5 If the local DHCP does not offer the correct TFTP address, enable the phone to use an alternate TFTP server.
This is often necessary in VPN scenario.
Related Topics
Phone Cannot Connect to TFTP Server, on page 178

Determine DNS or Connectivity Issues

Procedure
Step 1 Use the Reset Settings menu to reset phone settings to their default values.
Step 2 Modify DHCP and IP settings:
a) Disable DHCP.
b) Assign static IP values to the phone. Use the same default router setting that other functioning Cisco IP
Phones use.
c) Assign a TFTP server. Use the same TFTP server that other functioning Cisco IP Phones use.
Step 3
On the Cisco Unified Communications Manager server, verify that the local host files have the correct Cisco
Unified Communications Manager server name mapped to the correct IP address.
Step 4 From Cisco Unified Communications Manager, choose System > Server and verify that reference to the
server is made by the IP address and not by the DNS name.
Step 5 From Cisco Unified Communications Manager, choose Device > Phone. Click Find to search for this phone.
Verify that you have assigned the correct MAC address to this Cisco IP Phone.
Step 6
Power cycle the phone.
Cisco IP Phone 7821, 7841, and 7861 Administration Guide for Cisco Unified Communications Manager 10.0 (SIP)
Troubleshooting Procedures
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