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Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
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Chapter9 Troubleshooting and Maintenance
Cisco Unified IP Phone Resets Unexpectedly
Verifying that the Phones Have Not Been Intentionally Reset
If you are not the only administrator with access to CiscoUnified CallManager,
you should verify that no one else has intentionally reset the phones.
You can check whether a CiscoUnified IP Phone received a command from
Cisco Unified CallManager to reset by pressing the Settings button on the phone
and choosing Status > Network Statistics. If the phone was recently reset one of
these messages appears:
•Reset-Reset—Phone closed due to receiving a Reset/Reset from
Cisco Unified CallManager administration.
•Reset-Restart—Phone closed due to receiving a Reset/Restart from
Cisco Unified CallManager administration.
Eliminating DNS or Other Connectivity Errors
If the phone continues to reset, follow these steps to eliminate DNS or other
connectivity errors:
Step1 Use the Erase softkey to reset phone settings to their default values. See the
“Resetting or Restoring the Cisco Unified IP Phone” section on page9-17 for
details.
Step2 Modify DHCP and IP settings.
a. Disable DHCP. See the “Network Configuration Menu” section on page4-7
for instructions.
b. Assign static IP values to the phone. See the “Network Configuration Menu”
section on page4-7 for instructions. Use the same default router setting used
for other functioning Cisco Unified IP Phones.
c. Assign TFTP server. See the “Network Configuration Menu” section on
page 4-7 for instructions. Use the same TFTP server used for other
functioning Cisco Unified IP Phones.
Step3 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.
Step4 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.