Ip Addressing And Routing - Cisco 7925G Administration Manual

Phone Does Not Register with Cisco Unified Communications Manager
For information about determining and changing TFTP server settings, see
or View Configuration File Name, on page

IP Addressing and Routing

Problem
The IP addressing and routing fields may not be correctly configured.
Solution
Verify the IP addressing for the Cisco Unified Wireless 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.
Note When the wireless IP phone loses the RF signal (goes out of the coverage area), the phone will not release
the DHCP server unless it reaches the timeout state.
Check for these 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. If you are using a DHCP server, and the wireless IP phone gets a response
from the DHCP server, the information is automatically configured. See Troubleshooting Switch Port
Problems, available at this URL:
tech_note09186a008015bfd6.shtml.
• IP Address, Subnet Mask, Primary Gateway: If you have assigned a static IP address to the phone, you
must configure settings for these options. See
If you are using DHCP, check the IP addresses distributed by your DHCP server. Be aware of DHCP conflicts
and duplicate IP addresses. See Understanding and Troubleshooting DHCP in Catalyst Switch or Enterprise
Networks, available at this URL:
note09186a00800f0804.shtml.
For information about determining and changing IP addressing, see
DNS Settings
Problem
The phone has incorrect DNS server information.
Solution
If you are using DNS to refer to Cisco Unified Communications Manager, 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
Cisco Unified Communications Manager system.
You must also ensure that DNS is configured to do reverse look-ups. The default setting on Windows 2000
is to perform forward-only look-ups.
For information about determining and changing DNS settings, see
Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Administration Guide
214
188.
http://www.cisco.com/en/US/products/hw/switches/ps708/products_
IP Network Settings, on page
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_
Troubleshooting
IP Network Settings, on page 92
92.
IP Network Settings, on page 92
IP Network Settings, on page
.
92.