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2. What channel does the end-to-end connection use?

End-to-end communications are carried on the B Channel.

3. What is the initial call request message called?

The initial call request message is a SETUP.

4. What is the call termination message called?

The call termination message is called a DISC (from DISConnect).

5. What information also accompanies this message?

The reason for the call termination accompanies the DISC message.

6. Why is this information significant?

Knowing the reason for a disconnect will allow ISDN communication problems to be diagnosed.

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Eicon Networks ISDN NT1 Specifiche Pagina 39