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Answer Posted / silpa
The D Channel is used for all the call maintenance traffic, such as call setup and call disconnect.
The D channel activity occurs between an ISDN user and the ISDN network. It does not pass across the network to the user at the other end.
The user at the other end of a call also uses a D Channel over which it conducts a separate dialogue with the network.
The network signaling is therefore separated from the B Channel which will carry the actual call itself. This connection does get established end-to-end between the two users.
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