Cisco CP-7975G Administration Guide - Page 92
Scroll to the DHCPv6 Address Released option
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Network Configuration Menu Chapter 4 Configuring Settings on the Cisco Unified IP Phone Table 4-4 IPv6 Configuration Menu Options (continued) Option Description To Change IPv6 DNS Server 1 Primary Domain Name System (DNS) server IPv6 DNS Server 2 (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 Validate 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 auto configuration. 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. 4-14 Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.5 OL-23092-01