Filter
Top Products
9-8
Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
OL-23091-01
Chapter 9 Troubleshooting and Maintenance
Cisco Unified IP Phone Resets Unexpectedly
• Reset-Restart—Phone received a Reset/Restart request from Cisco Unified Communications
Manager Administration.
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 Use the Erase softkey to reset phone settings to their default values. See Resetting or Restoring the Cisco
Unified IP Phones, page 9-13 for details.
Step 2 Modify DHCP and IP settings:
a. Disable DHCP. See Network Configuration Menu, page 4-5 for instructions.
b. Assign static IP values to the phone. See Network Configuration Menu, page 4-5 for instructions.
Use the same default router setting used for other functioning Cisco Unified IP Phones.
c. Assign a TFTP server. See Network Configuration Menu, page 4-5 for instructions. Use the same
TFTP server used 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
Determining the MAC Address for a Cisco Unified IP Phones, page 2-13.
Step 6 Power cycle the phone.
Checking Power Connection
In most cases, a phone will restart if it powers up by using external power but loses that connection and
switches to Power over Ethernet (PoE). Similarly, a phone may restart if it powers up by using PoE and
then gets connected to an external power supply.