Service providers around the world are deploying various types of TDM interfaces with SS7, E & M, E & M E1 Wink, FXO & FXS (Loop Start, Ground Start, Kewl Start), SF Signaling, Feature Group D, ISDN PRI etc. protocols. By bridging VoIP and TDM, carriers realize immediate benefits of improved scaling, reduced network costs, and faster time to market.