MCK EXTender??? 7000 for Branch Offices is an integrated networking product that delivers local calling capabilities, access to local trunk lines and full functionality of a central site telephone system to remote offices over circuit- and packet-based networks. EXTender PBXgateway??? II, located on the digital-line side of a central PBX/KTS, terminates the MCK EXTender 7000 and enables seamless voice and data communications between the remote and central locations using MCK EXTender??? technology. The complete EXTender PBXgateway II and MCK EXTender 7000 solution includes a built-in Channel Service Unit (CSU)/Data Service Unit (DSU), that enables direct interface with T1, PRI or Frame Relay lines resulting in significant cost savings and enhanced functionality for remote branch offices.