It is similar to Switched Voice Service (SVS) on the FTS2001 contracts. VS supports the full range of technical capabilities that are available in commercial offerings. In addition, VS is interoperable with the Public Switched Telephone Network (PSTN) and all Networx contractors VS networks. The diagram below shows VS connectivity from on-net locations, such as Agencies served by PBXs and Centrex Central Offices. VS calls typically traverse trunks to PBX and Centrex equipment and terminate in a variety of telephony equipment which may include secure telephone units and connection to Inmarsat mobile satellite devices. VS calls can be initiated from many types of telephony equipment, including single-line and multi-line key sets. VS supports outgoing voice calls by direct station-to-station dialing from on-net and off-net locations worldwide, including calling cards. In CONUS analog voice circuits have been replaced with digital equivalent circuits with a 64 kbps standard for both Time Division Multiplex (TDM) and Internet Protocol (IP) based backbone circuits. VS is a service comprised of voice circuits typically capable of carrying one telephone conversation or its digital equivalent.
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