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Finishing a call

Call disconnection also occurs through messages sent on the D-channel.

The message which conveys this information is the DISC, which also carries a cause

code.

A DISC may occur because one of the users terminates the call (by hanging up the phone,

for instance). The cause code will be 'normal call clearing'. A disconnection also may

happen before the call has been completed, for instance with cause code 'destination

busy', or for some other reason.

This diagram shows the interaction at the end of a successful call.

Receiving calls

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Eicon Networks ISDN NT1 Especificaciones Pagina 36