Registering Cisco IP phones with CME 8.x using IPv6

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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


DHCP Server

ipv6 dhcp pool phones
 address prefix 2001:A:B:C::/64
 import dns-server
 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


 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.

Related Information

Technical Support & Documentation - Cisco Systems

Configuring IP Phones in IPv4, IPv6, or Dual Stack Mode

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