Registering Cisco IP phones with CME 8.x using IPv6
This article gives a sample configuration of a CME router supporting SCCP registered Cisco IP phones with IPv6 addressing.
Voice call flow.
IP Phone >> SCCP >> CME 8.X
Physical network topology
IP phone >> Switch >> router
ipv6 dhcp pool phones address prefix 2001:A:B:C::/64 import dns-server domain-name example.com vendor-specific 9 suboption 1 address 2001:A:B:C::1 suboption 2 ascii "IP-Phone"
interface Vlan11 ipv6 address 2001:A:B:C::/64 eui-64 ipv6 enable ipv6 nd other-config-flag ipv6 dhcp server phones
telephony-service protocol mode dual-stack preference ipv6 max-ephones 12 max-dn 48 ip source-address 2001:A:B:C::1
The CME is in dual-stack mode. It means that it will support both Ipv4 and ipv6 addressing. However, please make sure that you enable "ipv6 cef" if you choose dual-stack.
Please make sure you use ipv6 supported IOS on the switch if you choose to connect phones to the switch
Related show Commands
This section provides information you can use to confirm your configuration is working properly.
"show ephone summary" can be used to check the ipv6 address leased to the Ip phones
Certain show commands are supported by the Output Interpreter Tool (registered customers only), which allows you to view an analysis of show command output.
Configuring IP Phones in IPv4, IPv6, or Dual Stack Mode http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmesystm.html#wp1047058