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Troubleshooting and Maintenance

Voice VLAN Setup Errors

Problem

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.

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 whether a Cisco Unified IP Phone received a command from Cisco Unified Communications

Manager to reset by pressing the Applications Menu button on the phone and choosing Settings > Status >

Network Statistics. If the phone was recently reset one of these messages appears:

• Reset-Reset: Phone received a Reset-Reset request from Cisco Unified Communications Manager

• Reset-Restart: Phone received a Reset-Restart request from Cisco Unified Communications Manager

DNS or Other Connectivity Errors

Problem

The phone reset continues and you suspect DNS or other connectivity issues.

Solution

If the phone continues to reset, eliminate DNS or other connectivity errors with

Issues, on page

Power Connection Problems

Problem

The phone does not appear to be powered up.

Administration.

16.

Voice VLAN Setup Errors

Determine DNS or Connectivity

Troubleshooting and Maintenance