Verifying Physical Connection; Identifying Intermittent Network Outages; Verifying Dhcp Settings; Checking Static Ip Address Settings - Cisco 7960G Administration Manual

Chapter 8 Troubleshooting the Cisco IP Phone

Verifying Physical Connection

Identifying Intermittent Network Outages

Verifying DHCP Settings

Checking Static IP Address Settings

Cisco IP Phone Administration Guide for Cisco CallManager 4.0, Cisco IP Phones 7960G/7940G
OL-4825-01
Verify that the Ethernet connection to which the Cisco IP Phone is connected is
up. For example, check if the particular port or switch to which the phone is
connected is down.
Intermittent network outages affect data and voice traffic differently. Your
network might have been experiencing intermittent outages without detection. If
so, data traffic can resend 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.
The following suggestions can help you determine if the phone has been properly
configured to use DHCP:
Verify that you have properly configured the phone to use DHCP. See the
1.
"Network Configuration Menu Options" section on page 4-6
information.
Verify that the DHCP server has been set up properly.
2.
Verify the DHCP lease duration. Cisco recommends that you set it to 8 days.
3.
Cisco 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 will be denied, forcing the phone to restart and request a new IP
address from the DHCP server.
If the phone has been assigned a static IP address, verify that you have entered the
correct settings. See the
page 4-6 for more information.
"Network Configuration Menu Options" section on
Resolving Startup Problems
for more
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