Chapter9 Troubleshooting and Maintenance
Resolving Startup Problems
9-8
Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
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•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 CiscoUnified CallManager 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 CallManager

A Cisco Unified IP Phone can register with a Cisco Unified CallManager server
only if the phone has been added to the server or if auto-registration is enabled.
Review the information and procedures in the “Adding Phones to the Cisco
UnifiedCallManager D atabase” section on page 2-13 to ensure that the phone has
been added to the Cisco Unified CallManager database.
To verify that the phone is in the CiscoUnified CallManager database, choose
Device > Find from CiscoU nified CallManager Administration to search for the
phone based on its MAC Address. For information about determining a MAC
address, see the “Determining the MAC Address of a Cisco UnifiedIP Phone”
section on page 2-20.
If the phone is already in the CiscoUnified CallManager database, its
configuration file may be damaged. See the “Creating a New Configuration File”
section on page 9-7 for assistance.
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.