Verifying Physical Connection; Identifying Intermittent Network Outages; Verifying Dhcp Settings - Cisco ATA 190 Administration Manual

Appendix D Troubleshooting and Maintenance
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:
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Verifying Physical Connection

Verify that the Ethernet connection to which the ATA 190 is connected is up. For example, check whether
the particular port or switch to which the phone is connected is down and that the switch is not rebooting.
Also make sure that there are no cable breaks.

Identifying Intermittent Network Outages

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, investigate whether an existing problem is
simply being exposed.

Verifying DHCP Settings

Follow this process to help determine if the phone has been properly configured to use DHCP:
Procedure
Verify that you have properly configured the phone to use DHCP. See the
Step 1
Settings" section on page 3-4
Step 2 Verify that the DHCP server has been set up properly.
Verify the DHCP lease duration. Cisco recommends that you set it to 8 days.
Step 3
The ATA 190 sends the DHCP request message to update the IP Address at half of the lease time. If no
response is received from the server, the ATA 190 starts the DHCP Discover process to get the new IP
address.
OL-31821-02
Verifying Physical Connection, page D-5
Identifying Intermittent Network Outages, page D-5
Verifying DHCP Settings, page D-5
Checking Static IP Address Settings, page D-6
Verifying Voice VLAN Configuration, page D-6
Eliminating DNS or Other Connectivity Errors, page D-6
for more information.
Cisco ATA 190 Analog Telephone Adapter Administration Guide for SIP (Version 1.1)
ATA 190 Resets Unexpectedly
"Configure Startup Network
D-5