Why use ISDN?
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A fax machine is configured to filter for analogue calls - will it accept G3 Fax calls? No, it will only accept those calls whose call type is specifically 'Generic Analogue'.
How might a PC be configured to ensure it never answers the phone?
What channel do the call management messages use?
 What is the name of the reference point that is located on the user side of an NT1?
What are TEIs?
How to vary the the amount of bandwidth you have available to you?
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.
Does the network provider supply the NT1 in North America?
What do the layers look like?
Why is this information significant?
How many devices may be connected to a PRI?
How to Establish the Link Layer?