How configuration errors in the ISPBX can prevent successful connections?
How many filters can be applied to a SETUP message?
Do users on an ISPBX have a D channel connection to the ISPBX or to the public ISDN network? The users on an ISPBX do not communicate directly with the public network at all.
What is the maximum number of simultaneous connections supported by a Primary Rate Interface?
Why use ISDN?
What are these types of NT1 known as?
How ISDN allows multiple devices to share a single line?
Where does this conversion normally take place?
In practice, what is the maximum number of devices that may be connected to a BRI which expects a fixed TEI?
When multiple users on an ISPBX are making calls, how many users does the public ISDN network see?
 What is the name of the reference point that is located on the user side of an NT1?
Where else is rate adaptation employed?
What are BRI and PRI? What are Channels?