Cisco 8831NR Administration Manual page 135

Troubleshooting and Maintenance
Intermittent Network Outages
Problem
The conference phone resets because the network may be experiencing intermittent outages.
Solution
Intermittent network outages affect data and voice traffic differently. Your network might be 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 to the network. Contact the network
administrator for information on known problems in the voice network.
DHCP Setting Errors
Problem
The DHCP settings may be incorrect.
Solution
Follow this process to help determine if the phone has been properly configured to use DHCP:
1. Verify that you have properly configured the conference phone to use DHCP. See the
Menu, on page 62
2. Verify that the DHCP server has been set up properly.
3. Verify the DHCP lease duration. Cisco recommends that you set it to 8 days.
conference 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 conference phone to
restart and request a new IP address from the DHCP server.
Static IP Address Setting Errors
Problem
The status IP address assigned to the conference phone may be incorrect.
Solution
If the conference phone has been assigned a static IP address, verify that you have entered the correct settings.
See the
Voice VLAN Setup Errors
Problem
If the conference phone appears to reset during heavy network usage (for example, following extensive web
surfing on a computer connected to the same switch as conference phone), it is likely that you do not have a
voice VLAN configured.
section for more information.
Network Setup Menu, on page 62
Cisco Unified IP Conference Phone 8831 and 8831NR Administration Guide
section more information.
Intermittent Network Outages
Network Setup
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