00346nam a2200133Ia 4500008004100000041001200041082001700053100001800070245002100088250001300109260003200122300001400154650004400168231217s9999    xx            000 0 und d  aEnglish  a621.385  ANG  aAngell, David 0aISDN for dummies  a1st ed.   c1995bComdex Computer Publ.  axxiii+332  aVideo conferencing Switching, telephone