1. When multiple users on an ISPBX are making calls, how many users does the public ISDN network see?

2. Do users on an ISPBX have a D channel connection to the ISPBX or to the public ISDN network?

3. An ISPBX can behave like a single user and a network - true or false?

4. A user on an ISPBX can use different D-Channel protocols to those in use by the public ISDN network connected to the ISPBX - true or false?