Cisco 7945G - Unified IP Phone VoIP Pemecahan Masalah dan Pemeliharaan - Halaman 5

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Troubleshooting and Maintenance

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 the

MAC Address. For information about determining a MAC address, see

Determination.

If the phone is already in the Cisco Unified Communications Manager database, its configuration file may be

damaged. See

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.

Problem

The phone displays "Security Error" on the screen.

Cause

When a Cisco Unified IP Phone boots, it performs an internal Power On Self Test (POST). POST checks for

existing encryption functionality. If POST detects that encryption functionality is missing, the phone fails to

boot, and the message "Security Error" appears on the screen.

Solution

To correct the problem, perform the following steps:

1. Reset the phone manually.

2. If the phone does not start up properly, power up the phone with the handset off-hook. When the phone

is powered up in this way, it attempts to launch a backup software image.

3. If the phone still does not start up properly, perform a factory reset of the phone. For instructions, see

Factory Reset, on page

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 Unified Communications Manager connection are stable, a

Cisco Unified IP Phone should not reset on its own.

Typically, a phone resets if it has problems connecting to the Ethernet network or to

Cisco Unified Communications Manager. These sections can help you identify the cause of a phone resetting

in your network:

Configuration File Corruption, on page 4

20.

Cisco Unified IP Phone Cannot Obtain IP Address

Cisco Unified IP Phone MAC Address

for assistance.

Troubleshooting and Maintenance