# Dialogic® NaturalAccess™ ISDN Software Supplementary Services Developer's Manual

This manual describes ISDN supplementary services that can be accessed using NaturalAccess ISDN Software. It provides:

- Background information about each available service, as it is defined in the specification for any applicable variants.

- A programming guide for NaturalAccess ISDN Messaging applications.

- Documentation of a demonstration program included with the software.

This document is intended for developers of telephony and voice applications who are using NaturalAccess. This document defines telephony terms where applicable, but assumes that the reader is familiar with basic telephony concepts and the C programming language.

Although some introductory material is provided, this manual also assumes that the reader is familiar with the operation of basic ISDN supplementary services, as described in appropriate specifications.

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