Determine DNS or Connectivity Issues
Procedure
Step 1
From Cisco Unified Communications Manager, choose Device > Phone > Find to locate the phone experiencing
problems.
Step 2
Choose Delete to remove the phone from the Cisco Unified Communications Manager database.
Step 3
Add the phone back to the Cisco Unified Communications Manager database. See
Communications Manager Phone Addition Methods
Step 4
Power cycle the phone.
Determine DNS or Connectivity Issues
If the phone continues to reset, follow these steps to eliminate DNS or other connectivity errors:
Procedure
Step 1
Use Erase to reset phone settings to their default values. See
page 21
Step 2
Modify DHCP and IP settings:
a) Disable DHCP. See
b) Assign static IP values to the phone. See
default router setting used for other functioning Cisco Unified IP Phones.
c) Assign a TFTP server. See
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.
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 > Find and verify that you have
assigned the correct MAC address to this Cisco Unified IP Phone. For information about determining a MAC
address, see
Step 6
Power cycle the phone.
General Troubleshooting Information
The following table provides general troubleshooting information for the Cisco Unified IP Phone.
Troubleshooting and Maintenance
16
for details.
Network Configuration Menu
Network Configuration Menu
Cisco Unified IP Phone MAC Address
for details.
Cisco Unified IP Phone Reset or Restore, on
for instructions.
Network Configuration Menu
for instructions. Use the same TFTP server used
Determination.
Troubleshooting and Maintenance
Cisco Unified
for instructions. Use the same
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