4-14
Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager  7.1
OL-18913-01
Chapter 4      Configuring Settings on the Cisco Unified IP Phone
  Network Configuration Menu
IPv6 DNS Server 1
IPv6 DNS Server 2
Primary Domain Name System (DNS) server (DNS Server 
1) and optional backup DNS servers (DNS Server 2) used 
by the phone.
If your configuration includes both DNSv6 and DNSv4 
servers, the phone will look for its DNS server in the 
following order:
1. IPv6 DNS Server 1
2. IPv6 DNS Server 2
3. DNS Server 1-5 for IPv4 (respectively)
1. Unlock network configuration 
options.
2. Set the DHCPv6 option to No.
3. Scroll to the appropriate DNS 
Server option, press the Edit 
softkey, and then enter a new 
DNS server IP address.
4. Press the Val idate softkey.
5. Repeat Steps 3 and 4 as needed to 
assign the backup DNS server.
6. Press the Save softkey.
DHCPv6 Address 
Released
Releases the IPv6 address that the phone has acquired 
from the DHCPv6 server or by stateless address 
autoconfiguration.
Note This field is only editable when the DHCPv6 
option is enabled.
1. Unlock network configuration 
options.
2. Scroll to the DHCPv6 Address 
Released option and press the Yes 
softkey to release the IP address 
assigned by DHCP, or press the 
No softkey if you do not want to 
release this IP address.
3. Press the Save softkey.
IPv6 Alternate TFTP Indicates whether the phone is using the IPv6 Alternate 
TFTP server.
1. Unlock network configuration 
options.
2. Scroll to the IPv6 Alternate TFTP 
option and press the Yes  softkey 
if the phone should use an 
alternative TFTP server. 
3. Press the Save softkey.
Table 4-4 IPv6 Configuration Menu Options (continued)
Option Description To Change