Verify Dns Settings; Check Dhcp Settings - Cisco 8831 Administration Manual

Troubleshooting procedures
Procedure
Step 1 In Cisco Unified Communications Manager Administration, choose Device > Phone. Enter search criteria to
locate the conference phone experiencing problems, and then click the device name.
Step 2
In the Phone Configuration window, click Delete to remove the conference phone from Cisco Unified
Communications Manager.
Step 3 Add the conference phone back to Cisco Unified Communications Manager.
Step 4
Power cycle the conference phone.
Related Topics
Cisco Unified Communications Manager IP Phone addition methods, on page 41

Verify DNS settings

To verify DNS settings, follow these steps:
Procedure
Step 1 Select Apps > Admin Settings > Network Setup > IPv4 Configuration > DNS Server 1.
Step 2 Verify that there is a CNAME entry in the DNS server for the TFTP server and one for Cisco Unified
Communications Manager.
Step 3 Ensure that DNS is configured to do reverse look-ups.

Check DHCP settings

DHCP can be enabled and disabled manually.
Note
Procedure
Step 1 On the conference station, select Apps > Admin Settings > Network Setup > IPv4 Configuration, and look
at the following options:
Step 2 • DHCP: If you have assigned a static IP address to the conference phone, you do not need to enter a value
for the DHCP Server option. However, if you are using a DHCP server, this option must have a value.
If it does not, check your IP routing and VLAN configuration. See Troubleshooting Switch Port Problems,
available at this URL:
notes_list.html
• IP Address, Subnet Mask, Default Router: If you have assigned a static IP address to the conference
phone, you must manually enter settings for these options.
Cisco Unified IP Conference Phone 8831 Administration Guide for Cisco Unified Communications Manager
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http://www.cisco.com/en/US/customer/products/hw/switches/ps708/prod_tech_
Troubleshooting and maintenance