What is LAP-D?
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How ISDNs are connected together?
 What is the name of the reference point that is located on the user side of an NT1?
What do the layers look like?
call flow in nss ? and what is sri signal?
What is the essential difference between them?
What information also accompanies this message?
How many devices may be connected to a PRI?
How can I get more information?
How configuration errors in the ISPBX can prevent successful connections?
What is the significance of the TEI in B channel communication?
What is Soft-fax and Soft-modem?
What are SAPIs?