s. The other dramatic change required is the widespread adoption of IPv6. With IPv6, the problems running out of available IP addresses is resolved with the dramatic increase in routable IP addresses and the dramatic increases in features. Chapter 13: Future of Unified Communications 307 The current state-of-the-art technologies for immersive experiences are Cisco Telepresence technologies that were described in early sections. Telepresence deploy- ments currently require a controlled environment and controlled endpoints and are typi- cally deployed on an IPv4 network. IPv6 and Its Effect on the Future of UC IPv6 is a technology that has been "almost" ready to deploy for several years. As of the publishing of this book in 2010, it still has not been successful. However, as a basis for additional enhancements to UC, the importance of IPv6 cannot be understated. There are significant benefits IPv6 brings to both the consumer and the operator of networks. Consumers will use a myriad of devices without the inherent problem with connectivity issues. With Ipv6, each user can have a large number of devices and will not have as many issues that exist today with using private addressing schemes and mapping the schemes, in sometimes awkward ways, to public IP addressing schemes to access the rich content of the Internet. With IPv6, each end user could literally have a million devices and each of them would access rich Internet content in a secure, flexible, and reliable way. This change does imply that in the next 40 years all consumer IP devices will be changed. It is not an unrealistic expectation. Today's consumer devices are designed for a 3-to-5- year lifecycle. Within the next 40 years, there is little chance that any device created today would be on the network. However, IPv6 has a great capability for backward com- patibility, SO accessing older content for consumers and some older devices will not be a problem. In 40 years it will not be uncommon to look at an iPhone or a Cisco Desktop IP Phone with the same nosta