The objectiveof this Recommendationis to provide overall parameter exchange principles and functional descriptionsfor ISDN interworking.This Recommendation describes the principles for parameter exchange mechanisms.It is recognized that depending on the available (end-to-end) signalling capability,the exchange of parameters may use either out- or in-band procedures.Parameter exchange may be necessary to establish compatible interworking functions for a variety of applications.Typical examples where parameter exchange takes place include,terminal adaption compatibility establishment,modem typeselectionand voice encoding compatibility establishment.This does not imply,however,any requirement for an ISDN to support network basedmodem interworking.Figure 1 illustrates several voice and data applications, supportedby different networks and mechanisms. Parameter exchange may be necessary where interworking between different terminals or networks (as per other Recommendations) is required.NOTE-Where interworkingprocedures exist,the appropriate references are made herein.
ITU-T I.515-1993 history
1993ITU-T I.515-1993 Parameter Exchange for ISDN Interworking (Study Group XVIII) 18 pp