Checking Static Ip Address Settings; Verifying Voice Vlan Configuration; Verifying That The Phones Have Not Been Intentionally Reset - Cisco 7970G - IP Phone VoIP Administration Manual

Cisco Unified IP Phone Resets Unexpectedly

Checking Static IP Address Settings

Verifying Voice VLAN Configuration

Verifying that the Phones Have Not Been Intentionally Reset

Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 6.1
9-10
Verify the DHCP lease duration. Cisco recommends that you set it to 8 days.
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.
If the phone has been assigned a static IP address, verify that you have entered the
correct settings. See the
more information.
If the Cisco Unified IP Phone appears to reset during heavy network usage (for
example, following extensive web surfing on a computer connected to same
switch as 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
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.
Chapter 9
"Network Configuration Menu" section on page 4-7
for details.
Troubleshooting and Maintenance
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for