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The NMS ISDN Messaging API Developer's Reference Manual provides:
Background information about ISDN.
A programming guide to NMS ISDN Messaging API applications.
A summary of functions organized by task.
An extensive reference section for functions, data structures, parameters, and codes.
The NMS ISDN product exposes ISDN protocols at three levels:
The LAPD service access point (SAP) for layer 2 protocols, providing direct access to the D channel.
The ACU SAP for access to a simplified abstraction of the Q.931 ISDN D channel layer 3 message protocols.
An ISDN primary and basic rate trunk interface, which is channelized and integrated with the Natural Call Control service.
This manual describes how to build applications that interface with the ISDN protocol stack at layers 2 and 3. For information on building applications that are integrated at higher layers, see the NMS ISDN for Natural Call Control Developer's Manual.
This document is for developers of ISDN applications in C who are programming at the messaging level. The developer should be experienced with ITU Q.931 ISDN call control messages and call states. The developer should also be familiar with Natural Access, basic telephony concepts, and the C programming language.
