Cisco IP Phone Administration Guide

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.

Cisco IP Phone Specifications

General

Brand	Cisco
Model	IP Phone
Category	IP Phone
Language	English