Chapter 9 Troubleshooting and Maintenance
Cisco Unified IP Phone Resets Unexpectedly
9-10
Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE for Cisco Unified Communications Manager 6.1
OL-14620-01
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
“Network Configuration Menu” section on page 4-7 for
more information.
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 2-3 for 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:
• 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.
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