How the B and D channels share the line?
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What kind of cabling is used for a BRI?
What are TEIs?
What are BRI and PRI? What are Channels?
When multiple users on an ISPBX are making calls, how many users does the public ISDN network see?
What is ISDN's history?
 What is the name of the reference point that is located on the user side of an NT1?
What does ISDN give you?
What is the initial call request message called?
How many devices can be connected to a standard BRI line?
How to Establish the Link Layer?
What is the essential difference between ISDN and the ordinary telephone system (PSTN)?
Does a Terminal Adapter always contain a Codec or Modem?