ISDN consists of following

Bearer Services: provide the means to transfer information between users without the network manipulating the contents of that
information. Belongs to first three layers.
Teleservices: the network may change or process the contents of the data. Correspond to 4-7 layers.
Supplementary services: provide additional functionality to the bearer services and teleservices.

view/download: ISDN (size 933KB)

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