A new isdn packet handler interface

Public packet switching services are widely available today. These services are offered on Packet Switch Public Data Networks (PSPDNs) and are based on Recommendation X.25, the mature standards developed by the International Telegraph and Telephone Consultative Committee (CCITT). The access procedures for supporting X.25 packet services on Integrated Services Digital Network (ISDN) are specified in CCITT Recommendation X.31. This paper describes the attributes of a Packet Handler Interface (PHI). The PHI links the ISDM exchange with a Packet Handler (PH) function that resides on the PSPDN which supports X.31 packet services for ISDN users.