Verify The Physical Connection; Identify Intermittent Network Outages; Verify Dhcp Settings - Cisco ATA 191 Administration Manual

Analog telephone adapter
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Troubleshoot and Maintenance

Verify the Physical Connection

Procedure
Verify that the ATA's Ethernet connection 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.
Make sure that there are no cable breaks.

Identify 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.
Procedure
If you are experiencing problems with the voice network, investigate whether an existing problem is simply
being exposed.

Verify DHCP Settings

Follow this process to help determine if the phone has been properly configured to use DHCP:
Procedure
Step 1
Verify that you have properly configured the phone to use DHCP.
Step 2
Verify that the DHCP server has been set up properly.
Step 3
Verify the DHCP lease duration. Cisco recommends that you set it to 8 days.
The ATA 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 starts the DHCP Discover process to get the new IP address.
Related Topics
Configure Startup Network Settings, on page 24
Eliminate DNS or Other Connectivity Errors, on page 50
Cisco ATA 191 Analog Telephone Adapter Administration Guide for Cisco Unified Communications Manager
Verify the Physical Connection
49

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