ISO/IEC 20113:2004 defines the Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Specification, functional model and information flows - Make call request supplementary service, providing a technical reference for understanding how a make call request supplementary service is structured and exchanged within a private integrated services network. For engineering teams, system integrators, and compliance reviewers, it helps align technical evaluation, interoperability review, and documented assessment of signaling behavior within telecommunications workflows. As a derived document connected to ISO/IEC 20113, it supports targeted review of the parent reference in procurement and conformity assessment activities.

Purpose of ISO/IEC 20113:2004

The purpose of ISO/IEC 20113:2004 is to describe the functional model and information flows associated with the make call request supplementary service in a private integrated services network context. That makes it useful when tracing how service behavior should be represented in specifications, interface documentation, and verification activities. Organizations may use it to support technical review, clarify implementation assumptions, and reduce ambiguity during system integration or documented evaluation. The parent reference relationship suggests it is intended as a supporting technical document rather than a broad standalone procurement requirement.

Compliance applications of ISO/IEC 20113:2004

ISO/IEC 20113:2004 is relevant in compliance workflows that involve telecommunications platforms, call control features, and network service validation. It may be used during technical assessment of private integrated services network equipment, interface testing, and conformity assessment preparation where supplementary service behavior needs to match documented expectations. Procurement teams and laboratories can reference it when reviewing vendor documentation, defining acceptance criteria, or structuring verification activities for operational consistency. It is particularly useful where engineering documentation must show how a call request service is modeled and exchanged within the system.

Benefits of ISO/IEC 20113:2004

Using ISO/IEC 20113:2004 can improve technical clarity and reduce risk in specification, testing, and integration work. By defining the service model and information flows, it supports more consistent engineering validation, better interoperability review, and cleaner alignment between implementation and documented requirements. It can also help teams prepare for conformity assessment by establishing a common reference for behavior checks and acceptance planning. For organizations managing telecommunications deployments, the document supports quality workflows, procurement review, and controlled technical compliance processes with less ambiguity.

• Supports review of the make call request supplementary service within a private integrated services network framework
• Useful for documenting service behavior, information flows, and implementation assumptions
• Assists testing workflows, interface verification, and acceptance planning
• Provides a supporting compliance reference for engineering documentation and procurement review