Fixed mobile convergence - wireline carriers and FMC

Many market trends and business drivers are pushing fixed mobile convergence solutions that enable seamless handoff of calls--and call features--across wireline and wireless networks to become a reality, today.

[Sarah]

After reading this description I used google to get some more information and found this ( http://www.ect-virtualpbx.com/Fixed_Mobile_Co... ). Do you know in which way this is useful?! Thanks for sharing information, Sarah