Verifying Dhcp Settings; Checking Static Ip Address Settings; Verifying Voice Vlan Configuration - Cisco 7911G - IP Phone VoIP Administration Manual

Cisco Unified IP Phone Resets Unexpectedly

Verifying DHCP Settings

Checking Static IP Address Settings

Verifying Voice VLAN Configuration

Cisco Unified IP Phone 7906G and 7911G for Cisco Unified Communications Manager 6.0
9-10
The following suggestions can help you determine if the phone has been properly
configured to use DHCP:
Verify that you have properly configured the phone to use DHCP. See the
1.
"Network Configuration Menu" section on page 4-7
Verify that the DHCP server has been set up properly.
2.
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.
Chapter 9
"Network Configuration Menu" section on page 4-7
Troubleshooting and Maintenance
for more information.
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