Chapter9 Troubleshooting and Maintenance
Resolving Startup Problems
9-6
Cisco Unified IP Phone 7906G and 7911G Administration Guide for Cisco Unified CallManager
OL-10008-01
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 CiscoUnified CallManager,
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 CallManager 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 CallManager Settings
On the Cisco Unified IP Phone, press the Applications Menu button and select
Settings > Network Configuration > CallManager 1–5. The CiscoUnified 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 CiscoUnified CallManager” section on page9-4 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.