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1 What is ISDN? 241
2 What are the service limitations? 246
3 What are the features and applications? 288
4 What supplementary services does ISDN offer? 307
5 Are the ISDN rates different from fixed line rates? 257
6 Why is an ISDN line more advanced than an analogue line? 213
7 Where do you apply for ISDN? 247
8 Can I keep my existing telephone numbers if I convert to ISDN? 220
9 What are the functionalities of ISDN? 269