Citel's EXTender 1100A gives teleworkers and other single users seamless remote access to corporate voice and data networks using POTS lines. Our long standing E-1000U series have been improved / replaced with the E-1100A-SUC and E-1100A-RUC.. These units can be deployed on a number of PBXs, including Definity, Meridian, Norstar, Magix.  This pair of units will permit a digital standard phone to work at a remote location, using an analig (dial-up)  line to connect between the 2 sites.  Unfortunately the  "dedicated line mode" is not supported.  These units are backward compatible with the E-1000U series.