This was one of the questions raised late last year in an interview I did with Greg Galitzine.
A suite of software applications will deliver unified communications, which I view as "Communications integrated to optimize business processes". UC not only unifies the user experience by integrating all forms of communications with desktop applications (dominated by MSFT and IBM), but also unifies the IT infrastructure through software. UC multi-vendor environments will be brought together through communications integration software and embedded into workflows for:
• revenue growth and more engaging customer service
• enhanced user communications and business effectiveness
• richer collaboration and enhanced group effectiveness
• better asset utilization and accelerated business processes.
In two words: Open UC.