Voice Message Connection Control for PSTN and N- ISDN Subscribers in ATM Switching System

摘要

The ATM switching system accommodating the public switched telephone network (PSTN) and narrowband ISDN (N-ISDN) subscribers should ensure the continued sup- port of existing services and applications and guarantee the same quality of voice services for the telephone users [1]. The voice message connection control discussed in this paper is one of the various technical issues for voice services in the interworking function unit, IWF between asynchronous transfer mode (ATM) node ad existing synchronous transfer mode (STM) node [2].