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This manual explains how to develop an ISDN-based telephony application using NMS ISDN software. This manual concentrates on building NMS ISDN applications that perform call control using the Natural Access Call Control (NCC) service. For information on building applications that interface with the NMS ISDN protocol stack at lower layers, see the NMS ISDN Messaging API Developer's Reference Manual.
This document targets developers of telephony and voice applications who are using Natural Access. This document defines telephony terms where applicable, but assumes that the reader is familiar with basic telephony concepts. It also assumes that the user is familiar with the C programming language.
