1) Cisco IP Phones with dual stack support:
• Third generation Cisco IP Phones running SCCP only :
Cisco 7906G, Cisco 7911G, Cisco 7931G, Cisco 7941G, Cisco 7941GE
Cisco 7942G, Cisco 7945G, Cisco 7961G, Cisco 7961GE, Cisco 7962G
Cisco 7965G, Cisco 7970G, Cisco 7971G-GE, Cisco 7975G
2) Dual Stack SIP trunk
Please refer to IPv6 and UC - take a look at http://www.cisco.com/en/US/solutions/ns340/ns414/ns742/ns818/landing_ipv6.html
3) Please follow the solutions componets (IP phones, GW etc) as per the above document.
Regards,
Jay