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Cisco Unified IP Phone 6901 and 6911 Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP)
OL-23874-01
Chapter 7 Troubleshooting and Maintenance
Resolving Startup Problems
Note • When you remove a phone from the Cisco Unified Communications Manager database, its
configuration file is deleted from the Cisco
Unified Communications Manager TFTP server. The
phone’s directory number or numbers remain in the Cisco
Unified Communications Manager
database. They are called “unassigned DNs” and can be used for other devices. If unassigned DNs
are not used by other devices, delete them from the Cisco
Unified Communications Manager
database. You can use the Route Plan Report to view and delete unassigned reference numbers.
Refer to Cisco Unified
Communications Manager Administration Guide for more information.
• Changing the buttons on a phone button template, or assigning a different phone button template to
a phone, may result in directory numbers that are no longer accessible from the phone. The directory
numbers are still assigned to the phone in the Cisco
Unified Communications Manager database, but
there is no button on the phone with which calls can be answered. These directory numbers should
be removed from the phone and deleted if necessary.
Registering the Phone with Cisco Unified Communications Manager
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
“Adding Phones to the Cisco Unified
Communications Manager Database” section on page 2-7 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
“Using Cisco
Unified IP Phones with Different Protocols” section on page 2-11.
If the phone is already in the Cisco Unified Communications Manager database, its configuration file
may be damaged. See the
“Creating a New Configuration File” section on page 7-4 for assistance.
For more information on licensing go to the Licenses for Phones section in the Cisco Unified
Communications Manager System Guide
Symptom: Cisco Unified IP Phone Unable to Obtain IP Address
If a phone is unable to obtain an IP address when it starts up, the phone may be not be on the same
network or VLAN as the DHCP server, or the switch port to which the phone is connected may be
disabled. Make sure that the network or VLAN to which the phone is connected has access to the DHCP
server, and make sure that the switch port is enabled.