For more than ten years IPv6 has been a varyingly hot subject. At several occasions people in the business have believed that IPv6 will finally gain momentum, and spread throughout networks of the world.
This is, again, one of those occasions, and it is a legitimate question whether to take the cries seriously now, when the earlier cries have been crying wolf. There are several answers to this question.
One answer is that the addresses are in fact running out now. In 2011 the lastI IPv4 addresses are expected to be handed out, and then we’re all out.
Another answer is that IPv6 is increasingly usable, as operating systems and software to higher and higher degrees are designed to support IPv6.
When the world of telephony is starting to use IP to a somewhat ubiquitous extent, for example when IMS is reaching its full potential and roll-out, the need for addresses will rise dramatically and IPv4 will be an unwanted liability.