Overview
SIST EN 300 172 V1.5.1:2005 establishes the standardized inter-exchange signalling protocol for circuit-mode basic services within Private Integrated Services Networks (PISN). This Slovenian standard endorses the European Standard EN 300 172, which itself is based on the International Standard ISO/IEC 11572 (2000) with modifications. This protocol, widely known as part of QSIG, facilitates interoperability for telephony, enabling connectivity and consistent signalling between private exchanges within organizational networks.
Targeted at organizations deploying advanced telephone networks, SIST EN 300 172 helps ensure seamless, standardized communication within and between Private Integrated Services Networks leveraging ISDN concepts.
Key Topics
- PISN Signalling Protocol: Defines how exchanges within a Private Integrated Services Network communicate to establish, maintain, and terminate circuit-switched connections.
- Circuit-mode Basic Services: Focus on core telephony services, providing reliable voice or data transmission between two points within the PISN.
- Q-reference Point: The protocol applies specifically at the Q-reference point, ensuring consistent information exchange across inter-connected exchanges.
- International Compatibility: Builds on ISO/IEC 11572 principles, modified to fit European and local requirements for PISN communication.
- Reference Updates: Contains up-to-date cross-references with related EN and ETS standards, ensuring current application in modern network environments.
Applications
The interoperability provided by SIST EN 300 172 V1.5.1 is essential for organizations seeking:
- Enterprise Telephony Networks: Integrating multiple PBXs (Private Branch Exchanges) in large organizations or across dispersed locations, supporting secure, reliable internal communications.
- Virtual Private Networks (VPNs): Enabling the use of private telecommunications over shared or public infrastructure, maintaining service transparency and quality.
- Migration to ISDN/VoIP: Supporting a harmonized transition from legacy telephony systems to ISDN or IP-based solutions by adhering to standardized signalling principles.
- Managed Service Providers: Facilitating consistent delivery of telephony services in multi-site environments, supporting growth and scalability.
- Supplementary Service Support: Forms the foundation for additional telephony services such as call transfer, forwarding, and identification, leveraging related protocols.
Related Standards
SIST EN 300 172 V1.5.1 references and aligns with a range of related telecommunications standards to ensure robust service and interoperability:
- EN 300 189 - Addressing in PISN ([ISO/IEC 11571], modified)
- EN 300 171 - Service descriptions and functional capabilities for circuit-mode bearer services ([ISO/IEC 11574], modified)
- ETS 300 475-1 - Reference configuration for PTN eXchanges ([ISO/IEC 11579-1], modified)
- EN 300 239 - Generic functional protocol for supplementary service support ([ISO/IEC 11582], modified)
- EN 301 049 - Circuit-mode multi-rate bearer services ([ISO/IEC 11584], modified)
- ETS 300 173 - Identification supplementary service
- EN 301 820 - Common Information Additional Network Feature
- EN 300 403-1 - DSS1 protocol for basic call control ([ITU-T Q.931], modified)
These related documents complement SIST EN 300 172, enabling a comprehensive and futureproof PISN implementation.
Keywords: PISN, inter-exchange signalling protocol, circuit-mode basic services, QSIG, ISDN, enterprise telephony, VPN, Euro standard, telecommunication interoperability, private network signalling