9-9
Cisco Unified IP Video Phone 7985G Administration Guide
OL-8726-02
Chapter 9 Troubleshooting and Maintenance
Resolving Startup Problems
Verifying Physical Connection
Verify that the Ethernet connection to which the Cisco Unified IP Video Phone is
connected is up. For example, check whether the particular port or switch to
which the phone is connected is down.
Identifying Intermittent Network Outages
Intermittent network outages affect data and voice traffic differently. Your
network may have been experiencing intermittent outages without detection. If so,
data traffic can re-send lost packets and verify that packets are received and
transmitted. However, voice traffic cannot recapture lost packets. Rather than
retransmitting a lost network connection, the phone resets and attempts to
reconnect its network connection.
If you are experiencing problems with the voice network, you should investigate
whether an existing problem is simply being exposed.
Verifying DHCP Settings
The following suggestions can help you determine whether the phone has been
properly configured to use DHCP:
•
Verify that you have properly configured the phone to use DHCP. See the
“Network Configuration Menu” section on page 4-6
for more information.
•
Verify that the DHCP server has been set up properly.
•
Verify the DHCP lease duration. Cisco recommends that you set it to 8 days.
Cisco Unified IP Phones send messages with request type 151 to renew their
DHCP address leases. If the DHCP server expects messages with request type
150, the lease the server denies and forces the phone to restart and request a
new IP address from the DHCP server.
Checking Static IP Address Settings
If the phone has been assigned a static IP address, verify that you have entered the
correct settings. See the
“Network Configuration Menu” section on page 4-6
for
more information.
