Cisco 8961 Administration Manual page 296

Cisco Unified IP Phone Resets Unexpectedly
Static IP address settings errors
Problem
The static IP address assigned to the phone may be incorrect.
Solution
If the phone is assigned a static IP address, verify that you have entered the correct settings. See
Setup menu, on page 104
Voice VLAN setup errors
Problem
If the Cisco Unified IP Phone appears to reset during heavy network usage, it is likely that you do not have
a voice VLAN configured.
Solution
Isolating the phones on a separate auxiliary VLAN increases the quality of the voice traffic.
Phones have not been intentionally reset
Problem
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.
Solution
You can check if a Cisco Unified IP Phone received a command from Cisco Unified Communications Manager
to reset by pressing Applications on the phone and choosing Administrator Settings > Status > Network
Statistics.
• If the Restart Cause field displays Reset-Reset, the phone received a Reset/Reset from Cisco Unified
Communications Manager Administration.
• If the Restart Cause field displays Reset-Restart, the phone reset because it received a Reset/Restart
from Cisco Unified Communications Manager Administration.
DNS or other connectivity errors
Problem
The phone reset continues and you suspect DNS or other connectivity issues.
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager
10.0 (SIP)
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Troubleshooting and Maintenance
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