Cisco 7912G Administration Guide - Page 133
Verifying Physical Connection, Identifying Intermittent Network Outages, Verifying DHCP Settings
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Chapter 6 Troubleshooting the Cisco IP Phone Resolving Startup Problems Verifying Physical Connection Verify that the Ethernet connection to which the Cisco IP Phone is connected is up-and-running. For example, check if 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 might have been experiencing intermittent outages without detection, but data traffic can resend lost packets and verify 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. Therefore, if you are experiencing problems with the voice network, you should investigate whether an existing problem is simply being exposed at this point. Verifying DHCP Settings The following procedure can help you determine if the phone has been properly configured to use DHCP: Procedure Step 1 Step 2 Step 3 Verify that you have properly configured the phone to use DHCP. See the "Modifying DHCP Settings" section on page 4-9 for details. Verify that the DHCP server has been set up properly. Verify the DHCP lease duration. Cisco recommends that you set it to 8 days. 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 "Configuring IP Settings" section on page 4-15. Cisco IP Phone Administration Guide for Cisco CallManager 3.3, Cisco IP Phones 7902G/7905G/7912G OL-6313-01 6-19