Cisco 7902G - Unified IP Phone VoIP, Руководство администратора

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Chapter 7 Troubleshooting the Cisco Unified IP Phone
Cisco Unified IP Phone Resets Unexpectedly
7-8
Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.0 (SCCP), Cisco Unified IP Phones
OL-8151-01
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.
Cisco Unified IP Phone Resets Unexpectedly
If users report that their phones are resetting during calls or resetting while idle
on their desk, you should investigate the cause. If the network connection and
Cisco Unified CallManager 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 CallManager. These sections can help you identify the cause of
a phone resetting in your network:
• Verifying Physical Connection, page 7-8
•
Identifying Intermittent Network Outages, page 7-9
• Verifying DHCP Settings, page 7-9
•
Checking Static IP Address Settings, page 7-9
• Verifying Voice VLAN Configuration, page 7-9
•
Verifying that the Phones Have Not Been Intentionally Reset, page 7-10
• Eliminating DNS or Other Connectivity Errors, page 7-10
Verifying Physical Connection
Verify that the Ethernet connection to which the Cisco Unified IP Phone is
connected is up. For example, check if the particular port or switch to which the
phone is connected is down.