Eliminating dns or other connectivity errors – Cisco 7912G User Manual
Page 114
Chapter 7 Troubleshooting the Cisco Unified IP Phone
Cisco Unified IP Phone Resets Unexpectedly
7-10
Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.0 (SIP), Cisco Unified IP Phones
OL-8131-01
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
Reset the phone to factory defaults. See the
IP Phone” section on page 7-15
for details.
Step 2
Modify DHCP and IP settings.
a.
Disable DHCP. See
for details.
b.
Assign static IP values to the phone. See
for details.
Use the same default router setting used for other functioning Cisco Unified
IP Phones.
c.
Assign a TFTP server. See
for details. Use the same
TFTP server used for other functioning Cisco Unified IP Phones.
Step 3
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.
Step 4
From Cisco Unified CallManager Administration, choose System > Server and
verify that the server is referred to by its IP address or host name.
Step 5
From Cisco Unified CallManager, select Device > Phone and verify that you have
assigned the correct MAC address to this Cisco Unified IP Phone.
To determine the MAC address of a phone, see the
Address of a Cisco Unified IP Phone” section on page 2-12
Step 6
Power cycle the phone.