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. See Create New Configuration File, on page 88.
Cisco Unified Communications Manager Phone Registration
Problem
The phone is not registered with the Cisco Unified Communications Manager.
Solution
A Cisco Unified IP Phone can register with a Cisco Unified Communications Manager server only if the
phone has been added to the server or if auto-registration is enabled and if there is a sufficient number of unit
licenses. Review the information and procedures in the Cisco Unified Communications Manager Phone
Addition Methods, on page 26 to ensure that the phone has been added to the Cisco Unified Communications
Manager database.
To verify that the phone is in the Cisco Unified Communications Manager database, choose Device > Phone
> Find from Cisco Unified Communications Manager Administration to search for the phone based on its
MAC Address. For information about determining a MAC address, see the MAC Address for Cisco Unified
IP Phone Determination, on page 29.
If the phone is already in the Cisco Unified Communications Manager database, its configuration file may be
damaged. See the Create New Configuration File, on page 88 for assistance.
For more information on licensing, see the “Licenses for Phones” section in the Cisco Unified Communications
Manager System Guide.
Cisco Unified 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.
Cisco Unified SIP Phone 3905 Administration Guide for Cisco Unified Communications Manager 8.6 (SIP)
82
Troubleshooting and Maintenance
Startup Problems
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