Configuration File Corruption
Problem
If you continue to have problems with a particular phone that other suggestions in this chapter do not resolve,
the configuration file may be corrupted.
Solution
Create a new phone configuration file.
Cisco Unified Communications Manager Phone Registration
Problem
The phone is not registered with the Cisco Unified Communications Manager
Solution
A Cisco IP Phone can register with a Cisco Unified Communications Manager server only if the phone is
added to the server or if autoregistration is enabled. Review the information and procedures in Phone Addition
Methods, on page 91 to ensure that the phone is added to the Cisco Unified Communications Manager
database.
To verify that the phone is in the Cisco Unified Communications Manager database, choose Device > Phone
from Cisco Unified Communications Manager Administration. Click Find to search for the phone based on
the MAC Address. For information about determining a MAC address, see Determine the Phone MAC
Address, on page 90.
If the phone is already in the Cisco Unified Communications Manager database, the configuration file may
be damaged. See Configuration File Corruption, on page 306 for assistance.
Cisco IP Phone Cannot Obtain IP Address
Problem
If a phone cannot obtain an IP address when it starts up, the phone may not be on the same network or VLAN
as the DHCP server, or the switch port to which the phone connects may be disabled.
Solution
Ensure that the network or VLAN to which the phone connects has access to the DHCP server, and ensure
that the switch port is enabled.
Phone Reset Problems
If users report that their phones are resetting during calls or while the phones are idle, you should investigate
the cause. If the network connection and Cisco Unified Communications Manager connection are stable, a
phone should not reset.
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager
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Phone Reset Problems
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