What are SAPIs?
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What is the initial call request message called?
How Analogue fax and modem over ISDN?
How many devices may be connected to a BRI?
In practice, what is the maximum number of devices that may be connected to a BRI which expects a fixed TEI?
 What is the name of the reference point that is located on the user side of an NT1?
How users are connected to a public ISDN through an ISPBX?
What are the two protocols which perform rate adaptation?
What is the Frame Format ?
call flow in nss ? and what is sri signal?
Name the two forms in which an ISDN service can be provided to the user. ISDN can be supplied to the user in two forms:
Why is this information significant?
What are Protocols on B and D channels?