What are TEIs?
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call flow in nss ? and what is sri signal?
How to vary the the amount of bandwidth you have available to you?
How Analogue fax and modem over ISDN?
What are SPIDs?
What are ISDN Services?
 What is the name of the reference point that is located on the user side of an NT1?
What channel does the end-to-end connection use?
When multiple users on an ISPBX are making calls, how many users does the public ISDN network see?
What device converts the signals between the ISDN and the PSTN networks?
What call type is given to a fax call coming from an analogue network?
What kind of cabling is used for a BRI?
What the B and D channels do?