Cisco 7961G - Cisco IP Phone Resets Unexpectedly

Chapter 9 Troubleshooting and Maintenance
Cisco IP Phone Resets Unexpectedly
9-8
Cisco IP Phone Administration Guide for Cisco CallManager, Cisco IP Phone 7961G/7961G-GE and 7941G/7941G-GE
OL-6966-01
Registering the Phone with Cisco CallManager
A Cisco IP Phone can register with a Cisco 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 CallManager
Database” section on page 2-11 to ensure that the phone has been added to the
Cisco CallManager database.
To verify that the phone is in the Cisco CallManager database, choose Device >
Phone > Find from Cisco 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 for a Cisco IP Phone” section on
page 1-20.
If the phone is already in the Cisco CallManager database, its configuration file
may be damaged. See the “Creating a New Configuration File” section on
page 9-7 for assistance.
Symptom: Cisco 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.
Cisco IP Phone Resets Unexpectedly
If users report that their phones are resetting during calls or while idle on their
desk, you should investigate the cause. If the network connection and
Cisco CallManager connection are stable, a Cisco IP Phone should not reset on its
own.
Typically, a phone resets if it has problems connecting to the Ethernet network or
to Cisco CallManager. These sections can help you identify the cause of a phone
resetting in your network:
• Verifying the Physical Connection, page 9-9
• Identifying Intermittent Network Outages, page 9-9