What happens when a call is set up?
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How many devices may be connected to a PRI?
How the B and D channels share the line?
What call type is given to a fax call coming from an analogue network?
What protocols are used?
A user on an ISPBX can use different D-Channel protocols to those in use by the public ISDN network connected to the ISPBX - true or false?
What the B and D channels do?
Where does this conversion normally take place?
What channel do the call management messages use?
What is ISDN's history?
What are SAPIs?
What other method is there for converting synchronous and asynchronous data?
What is the essential difference between ISDN and the ordinary telephone system (PSTN)?