One of the promises, or benefits, of unified communications is being able to communicate with people where they are when you need them. The concept of ‘presence’ in Microsoft’s UCC (Unified Communications and Collaboration) is designed so that you can tell if a person is available or not, the contact them by the most efficient, or convenient means possible. One potential gap in the communications is determining if a user is actually at their desk, available to answer their office phone, or if they are moving about the building or even off site, in which case you would contact them via their cell phone. Of course, the user can always set up various call-forwarding solutions to try and send the calls to where they will be, but that is cumbersome and most users don’t understand it and won’t take the time. Now, new solutions are emerging that leverage the converged wireless networking and cellular communications capabilities of mobile phones so that the land line can be ditched and the mobile phone can be the sole method of voice communication. For more details, read Wi-Fi cellular convergence can boost mobile worker productivity on SearchMobileComputing.