Specifications

9-4
Cisco Unified IP Phone 7906G and 7911G for Cisco Unified Communications Manager 8.0
OL-21033-01
Chapter 9 Troubleshooting and Maintenance
Resolving Startup Problems
On the Cisco Unified IP Phone, press the Applications Menu button, then select Settings > Network
Configuration, and look at the following options:
• DHCP Server—If you have assigned a static IP address to the 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. Refer to Troubleshooting Switch Port
Problems, available at this URL: http://www.cisco.com/warp/customer/473/53.shtml
• IP Address, Subnet Mask, Default Router—If you have assigned a static IP address to the phone,
you must manually enter settings for these options. See Network Configuration Menu, page 4-5 for
instructions.
If you are using DHCP, check the IP addresses distributed by your DHCP server. Refer to Understanding
and Troubleshooting DHCP in Catalyst Switch or Enterprise Networks, available at this URL:
http://www.cisco.com/warp/customer/473/100.html#41
Verifying DNS Settings
If you are using DNS to refer to the TFTP server or to Cisco Unified Communications Manager, you
must ensure that you have specified a DNS server. Verify this setting by pressing the Applications Menu
button and selecting Settings > Network Configuration > DNS Server 1. You should also verify that
there is a CNAME entry in the DNS server for the TFTP server and for the
Cisco Unified Communications Manager system.
You must also ensure that DNS is configured to do reverse look-ups. Windows2000 is configured by
default only to perform forward look-ups.
Verifying Cisco Unified Communications Manager Settings
On the Cisco Unified IP Phone, press the Applications Menu button and select Settings > Network
Configuration > Communications Manager 1–5. The Cisco Unified IP Phone attempts to open a TCP
connection to all the Cisco Unified Communications Manager servers that are part of the assigned
Cisco Unified Communications Manager group. If none of these options contain IP addresses or show
Active or Standby, the phone is not properly registered with Cisco Unified Communications Manager.
See Registering the Phone with Cisco Unified Communications Manager, page 9-3 for tips on resolving
this problem.
Cisco CallManager and TFTP Services Are Not Running
If the Cisco CallManager or TFTP services are not running, phones may not be able to start up properly.
However, in such a situation, it is likely that you are experiencing a system-wide failure, and other
phones and devices are unable to start up properly.
If the Cisco CallManager service is not running, all devices on the network that rely on it to make phone
calls will be affected. If the TFTP service is not running, many devices will not be able to start up
successfully.
Note A service must be activated before it can be started or stopped. To activate a service, choose Tools >
Service Activation.
<<Reviewers: This procedure is different in the SIP Guide; can you verify which procedure is correct?>>