Physical Connection Problems; Intermittent Network Outages; Dhcp Setting Errors; Static Ip Address Setting Errors - Cisco 8831 Administration Manual

Troubleshooting and maintenance
• Voice VLAN setup errors, on page 128
• DNS or other connectivity errors, on page 128
• Power connection problems, on page 128

Physical connection problems

Problem
The physical connection to the LAN may be broken.
Solution
Verify that the Ethernet connection to which the phone is connected is up. For example, check if 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.

Intermittent network outages

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" section for more information.
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 "Network Setup menu" section more information.
Cisco Unified IP Conference Phone 8831 Administration Guide for Cisco Unified Communications Manager 9.0
Cisco Unified IP Conference Phone 8831 resets unexpectedly
"Network Setup
127