Eliminating Dns Or Other Connectivity Errors - Cisco 3951 Administration Manual

Chapter 7 Troubleshooting and Maintenance

Eliminating DNS or Other Connectivity Errors

Step 1
Step 2
Step 3
Step 4
Step 5
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If the phone continues to reset, follow these steps to eliminate DNS or other
connectivity errors:
Procedure
Reset the phone to factory defaults. See the
on page 7-1 for details.
Modify DHCP and IP settings:
Disable DHCP. See the
a.
for instructions.
Assign static IP values to the phone. See the
b.
section on page 4-3
for other functioning Cisco Unified IP Phones.
Assign a TFTP server. See the
c.
page 4-3 for instructions. Use the same TFTP server used for other
functioning Cisco Unified IP Phones.
On the Cisco Unified CallManager server, verify that the local host files have the
correct Cisco Unified CallManager server name mapped to the correct IP address.
From Cisco Unified CallManager, choose System > Server and verify that the
server is referred to by its IP address and not by its DNS name.
From Cisco Unified CallManager, 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 the
Address for a Cisco Unified IP Phone" section on page
Cisco Unified SIP Phone 3951 Administration Guide for Cisco Unified CallManager 5.1
Cisco Unified IP Phone Resets Unexpectedly
"Resolving Startup Problems" section
"Configuring Network Settings" section on page 4-3
for instructions. Use the same default router setting used
"Configuring Network Settings" section on
"Configuring Network Settings"
"Determining the MAC
2-12.
7-11