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?
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What other method is there for converting synchronous and asynchronous data?
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What must each SETUP message contain?
What kind of cabling is used for a PRI?
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What happens when a call is set up?
What happens to these bits when they are received by the ISDN telephone at the other end?
What are SAPIs?
Why is this information significant?
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