Specifications

9-8
Cisco Unified IP Phone 7906G and 7911G for Cisco Unified Communications Manager 8.0
OL-21033-01
Chapter 9 Troubleshooting and Maintenance
Troubleshooting Cisco Unified IP Phone Security
• 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.
Eliminating DNS or Other Connectivity Errors
If the phone continues to reset, follow these steps to eliminate DNS or other connectivity errors:
Procedure
Step 1 Use the Erase softkey to reset phone settings to their default values. See Resetting or Restoring the
Cisco Unified IP Phone, page 9-12 for details.
Step 2 Modify DHCP and IP settings.
a. Disable DHCP. See Network Configuration Menu, page 4-5 for instructions.
b. Assign static IP values to the phone. See Network Configuration Menu, page 4-5 for instructions.
Use the same default router setting used for other functioning Cisco Unified IP Phones.
c. Assign TFTP server. See Network Configuration Menu, page 4-5 for instructions. Use the same
TFTP server used for other functioning Cisco Unified IP Phones.
Step 3 On the Cisco Unified Communications Manager server, verify that the local host files have the correct
Cisco Unified Communications Manager server name mapped to the correct IP address. Refer to
Configuring The IP Hosts File on a Windows 2000 Communications Manager Server, available at this
URL: http://www.cisco.com/warp/customer/788/AVVID/cm_hosts_file.html
Step 4 From Cisco Unified Communications Manager, choose System > Server and verify that the server is
referred to by its IP address and not by its DNS name.
Step 5 From Cisco Unified Communications Manager, choose Device > Phone and verify that you have
assigned the correct MAC address to this Cisco Unified IP Phone. For information about determining a
MAC address, see Determining the MAC Address of a Cisco Unified IP Phone, page 2-11.
Step 6 Power cycle the phone.
Checking Power Connection on SIP Phones
In most cases, a phone will restart if it powers up using external power but loses that connection and
switches to PoE. Similarly, a phone may restart if it powers up using PoE and then gets connected to an
external power supply.
Troubleshooting Cisco Unified IP Phone Security
Table 9-1 provides troubleshooting information for the security features on the Cisco Unified IP Phone.
For information relating to the solutions for any of these issues, and for additional troubleshooting
information about security, refer to Cisco Unified Communications Manager Security Guide.