Narrowband ISDN and broadband ISDN service and network interworking
Bernhard Petri, D. Schwetje · IEEE Communications Magazine · 1996
For a significant period of time, B-ISDN will coexist with the 64-kb/s-based (narrowband) ISDN. The specification of a concept and the mapping functions employed for interworking between the two networks, in particular for voice services, is a major factor for the success of B-ISDN.