What are TEIs?
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How the structures of BRI and PRI compare
What information also accompanies this message?
How many filters can be applied to a SETUP message?
Why is there only one D channel in each interface?
What happens when a call is set up?
What is ISDN's history?
Number of devices equals number of subscriber numbers required for MSN - true or false?
What call type is given to a fax call coming from an analogue network?
 What is the name of the reference point that is located on the user side of an NT1?
How the B and D channels share the line?
What are SAPIs?
If two ISDN channels are used together, each connecting the same pair of users, how many calls are being made?