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The practice of front-ending a carrier's telephone switch with a softswitch. The softswitch culls traffic off the circuit-switched trunks and onto IP or ATM networks. See tandem switch.

See IP Multimedia Subsystem. Born as the International Softswitch Consortium (ISC) in 1999 and re-dubbed the International Packet Communications Consortium (IPCC) in 2003, the IMS Forum's creation ...