What the B and D channels do?
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 What is the name of the reference point that is located on the user side of an NT1?
Explain the call flow in nss and what is sri signal?
How many devices may be connected to a PRI?
What are the two types of equipment that can be used on ISDN called?
How can I get more information?
What determines which of these two protocols to use?
call flow in nss ? and what is sri signal?
When multiple users on an ISPBX are making calls, how many users does the public ISDN network see?
Why use ISDN?
Number of devices equals number of subscriber numbers required for MSN - true or false?
Where does this conversion normally take place?
What is the D channel used for?