The Unified Communication Solution leads to Network Agnostic, Agile, Cost Effective & Customer Experience Centric Services Platform.
The Way from Copper -> Fiber -> 2nd Generation -> 3rd Generation -> LTE , depicts evolution of Telecommunications over the decades , in the Network layer Infrastructure area
The Sevice Layer Infrastructure is built using techniques as Switching , Home Location Register (HLR) , Authetication ( AuC) etc . The Services vary over ranges such as IN , Voice , SMS , VOIP , IM , IPTV , IMS , Presence , MMS etc .
Top of this lies the Harmonization layer that performs the inter networking between different platforms and protocols .
The Application Layer consists of various usecases as Enhanced Screening , Social Networking Integration , Education Trade etc .
Telecom R & D 
Fantastic a picture is better than thousand words .