Eliminating Dns Or Other Connectivity Errors; Checking Power Connection - Cisco 8961 Administration Manual

Cisco Unified IP Phone Resets Unexpectedly

Eliminating DNS or Other Connectivity Errors

If the phone continues to reset, follow these steps to eliminate DNS or other connectivity errors:
Procedure
Use the Reset Settings menu to reset phone settings to their default values. See the
Step 1
Unified IP Phone" section on page 12-15
Modify DHCP and IP settings:
Step 2
a.
b.
c.
On the Cisco Unified Communications Manager server, verify that the local host files have the correct
Step 3
Cisco Unified Communications Manager server name mapped to the correct IP address.
From Cisco Unified Communications Manager, choose System > Server and verify that the server is
Step 4
referred to by the IP address and not by the DNS name.
From Cisco Unified Communications Manager, choose Device > Phone > Find and verify that you have
Step 5
assigned the correct MAC address to this Cisco Unified IP Phone. For information about determining a
MAC address, see the
page
Power cycle the phone.
Step 6

Checking Power Connection

In most cases, a phone restarts if it powers up by using external power but loses that connection and
switches to PoE. Similarly, a phone may restart if it powers up by using PoE and then gets connected to
an external power supply.
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 8.6 (SIP)
12-8
Disable DHCP. See the "Ethernet Setup Menu" section on page 7-4
Assign static IP values to the phone. See the
instructions. Use the same default router setting used for other functioning Cisco Unified IP Phones.
Assign a TFTP server. See the
same TFTP server used for other functioning Cisco Unified IP Phones.
"Determining the MAC Address for a Cisco Unified IP Phone" section on
2-14.
Chapter 12
for details.
"Ethernet Setup Menu" section on page 7-4
"Ethernet Setup Menu" section on page 7-4
Troubleshooting and Maintenance
"Resetting the Cisco
for instructions.
for
for instructions. Use the