> 1DSU-E1 doesn't exist, but a VWIC-1MFT-E1 exists - but doesn't work in > 1600. Dunno about 1700. Works in 2600 and up. Works in 1721 and 1750 with suitable IOS. Definitely not in the 1720. Steinar Haug, Nethelp consulting, sthaug at nethelp.no