What are SAPIs?
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What are Protocols on B and D channels?
What do the layers look like?
What is the Frame Format ?
What are SAPIs?
What is the initial call request message called?
How ISDN and analogue networks interact?
In order to be able to plug analogue devices into sockets on an NT1, what extra item of equipment would need to be included within the the NT1?
What are the two ISDN device addressing methods? The two types of device addressing in ISDN are known as:
What happens when a call is set up?
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.
What is the device inside an ISDN telephone that converts voice into digits?
If two ISDN channels are used together, each connecting the same pair of users, how many calls are being made?
WiFi Protocols 
