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Cisco Unified IP Phone 7960G/7940G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP)
OL-15498-01
Chapter 8 Troubleshooting and Maintenance
Resolving Startup Problems
Verifying IP Addressing and Routing
You should verify the IP addressing and routing settings on the phone. If you are using DHCP, the DHCP
server should provide these values. If you have assigned a static IP address to the phone, you must enter
these values manually.
On the Cisco Unified IP Phone, press the Settings button, choose 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 the
“Network Configuration Menu” section
on page 4-4 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 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 Communications Manager system.
You must also ensure that DNS is configured to do reverse look-ups.
Verifying Cisco Unified Communications Manager Settings
On the Cisco Unified IP Phone, press the Settings button, choose Network Configuration, and look at
the Communications Manager 1–5 options. 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 the
“Registering the Phone with Cisco Unified Communications Manager” section on page 8-3 for
tips on resolving this problem.
Cisco Unified Communications Manager and TFTP Services Are Not Running
If the Cisco Unified Communications Manager 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 Communications Manager 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.