How configuration errors in the ISPBX can prevent successful connections?
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What is the D channel used for?
How ISDN and analogue networks interact?
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 call type is given to a fax call coming from an analogue network?
What is the call termination message called?
What is the difference between Internet and ISDN ? Is both are same or is there any specific difference ...?
Name the two forms in which an ISDN service can be provided to the user. ISDN can be supplied to the user in two forms:
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?
How many devices may be connected to a PRI?
 What is the name of the reference point that is located on the user side of an NT1?
What is the maximum number of simultaneous connections supported by a Basic Rate Interface?