Origin of the Convergent Networks is in the ATM technology (Asyncronous Transfer Mode) that, paradoxically, is being implemented since 1990s over a syncronous Telecommunications network interconnected by Fiber Optics named Sincronous Digital Hierarchy (SDH).

ATM allows simultaneous transmission of voice, data and video and originated another technology called Multiprotocol Label Switching (MPLS), that integrates IP networks in the SDH.

Formerly ATM and, after, MPLS had allowed to the netwok backbones of the Telco operators and great enterprises to support a greater quantity of services and much more traffic. The evolution of ATM to MPLS continues until deriving nowadays in the named Next Generation Networks (NGN), that allow extend the services of Unified Communications networks to the SME and final users.