Cisco 7902G - Unified IP Phone VoIP, Administration Manual

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Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.0 (SCCP), Cisco Unified IP Phones
OL-8151-01
Chapter 7 Troubleshooting the Cisco Unified IP Phone
Resolving Startup Problems
Verifying IP Addressing and Routing
You should verify the IP addressing and routing settings for the
Cisco Unified IP 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.
Check for the following problems:
•
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
“Configuring IP Settings” section on page 4-20 .
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
For information about determining and changing IP addressing and routing
settings, see
Chapter 4, “Configuring Network Settings on the
Cisco Unified IP Phone,” or Appendix A, “Additional Configuration Methods
and Parameters.”
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. 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.
For information about determining and changing DNS settings, see Chapter 4,
“Configuring Network Settings on the Cisco Unified IP Phone,” or Appendix A,
“Additional Configuration Methods and Parameters.”