Verifying Dhcp Settings; Checking Static Ip Address Settings; Verifying The Voice Vlan Configuration; Verifying That The Phones Have Not Been Intentionally Reset - Cisco 7962G Administration Manual

Chapter 9 Troubleshooting and Maintenance

Verifying DHCP Settings

The following suggestions can help you determine if the phone has been properly configured to use
DHCP:
1.
2.
3.
Cisco Unified IP Phones send messages with request type 151 to renew their DHCP address leases. If
the DHCP server expects messages with request type 150, the lease will be denied, forcing the phone to
restart and request a new IP address from the DHCP server.

Checking Static IP Address Settings

If the phone has been assigned a static IP address, verify that you have entered the correct settings. See
the

Verifying the Voice VLAN Configuration

If the Cisco Unified IP Phone appears to reset during heavy network usage (for example, following
extensive web surfing on a computer connected to the same switch as the phone), it is likely that you do
not have a voice VLAN configured.
Isolating the phones on a separate auxiliary VLAN increases the quality of the voice traffic. See the
"Understanding How the Cisco Unified IP Phone Interacts with the VLAN" section on page 2-2
details.

Verifying that the Phones Have Not Been Intentionally Reset

If you are not the only administrator with access to Cisco Unified Communications Manager, you should
verify that no one else has intentionally reset the phones.
You can check whether a Cisco Unified IP Phone received a command from Cisco Unified
Communications Manager to reset by pressing the Settings button on the phone and choosing Status >
Network Statistics. If the phone was recently reset one of these messages appears:
•
•

Eliminating DNS or Other Connectivity Errors

If the phone continues to reset, follow these steps to eliminate DNS or other connectivity errors:
OL-18913-01
Verify that you have properly configured the phone to use DHCP. See the
Menu" section on page 4-5
Verify that the DHCP server has been set up properly.
Verify the DHCP lease duration. Cisco recommends that you set it to 8 days.
"Network Configuration Menu" section on page 4-5
Reset-Reset—Phone closed due to receiving a Reset/Reset from Cisco Unified Communications
Manager Administration.
Reset-Restart—Phone closed due to receiving a Reset/Restart from Cisco Unified Communications
Manager Administration.
Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 7.1
for more information.
for more information.
Cisco Unified IP Phone Resets Unexpectedly
"Network Configuration
for
9-7