Chapter9 Troubleshooting and Maintenance
Resolving Startup Problems
9-6
Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
OL-11524-01
Verifying DNS Settings
If you are using DNS to refer to the TFTP server or to
Cisco Unified CallManager, you must ensure that you have specified a DNS
server. Verify this setting by pressing the Settings button on the phone, choosing
Network Configuration, and scrolling to the DNS Server 1 option. You should
also verify that there is a CNAME entry in the DNS server for the TFTP server
and for the Cisco Unified CallManager system.
You must also ensure that DNS is configured to do reverse look-ups.
Verifying Cisco Unified CallManager Settings
On the Cisco Unified IP Phone, press the Settings button, choose Network
Configuration, and look at the CallManager 1–5 options. The Cisco Unified IP
Phone attempts to open a TCP connection to all the CiscoUnified CallManager
servers that are part of the assigned CiscoUnified CallManager group. If none of
these options contain IP addresses or show Active or Standby, the phone is not
properly registered with Cisco Unified CallManager. See the “Registering the
Phone with Cisco Unified CallManager” section on page 9-8 for tips on resolving
this problem.
Cisco Unified CallManager and TFTP Services Are Not Running
If the Cisco Unified 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 that other phones and devices are
unable to start up properly.
If the Cisco UnifiedCallManager 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.
To start a service, follow these steps:
Procedure
Step1 From Cisco Unified CallManager Administration, choose Application >
Cisco CallManager Serviceability.
Step2 Choose Tools > Control Center.