SIST EN 301 255 V1.1.1:2005 PDF

Overview

SIST EN 301 255 V1.1.1:2005 specifies the inter-exchange signalling protocol for the Message Waiting Indication (MWI) supplementary service within Private Integrated Services Networks (PISN). Published by the Slovenian Institute for Standardization (SIST) and harmonized with the European standard EN 301 255, this document provides the stage 3 description, detailing protocol procedures that enable the MWI service in environments based on ISDN concepts. The standard aligns with the framework established by ISO/IEC and supports interoperability in multi-vendor, multi-technology environments.

Key Topics

• Private Integrated Services Network (PISN): The standard addresses the needs of private digital networks that integrate multiple services, providing both voice and non-voice communications.

• Inter-Exchange Signalling Protocol (QSIG): Specifies the protocol-often referred to as QSIG-used at the Q reference point for communication between exchanges in PISN.

• Message Waiting Indication (MWI) Supplementary Service: Describes the service allowing notifications (such as lamp or icon indications) to users informing them of waiting messages, typically in voicemail or unified messaging systems.

• Protocol Modifications: Incorporates agreed modifications to ISO/IEC 15506 (1997) for European context, ensuring precise conformance to ETSI requirements.

• Supplementary Service Interactions: Identifies and clarifies the interaction (or lack thereof) between MWI and other PISN supplementary services, supporting accurate implementation.

• Normative References: Relies on and interlinks with other essential standards, including specifications for generic functional protocols, diversion services, service specifications, and reference configurations.

Applications

SIST EN 301 255 V1.1.1:2005 is particularly valuable for organizations designing and implementing private telecommunication networks that require robust support for supplementary messaging services. Typical practical applications include:

• Voicemail Notification: Provides the framework for indicating new voice messages to end users on digital telephone devices within enterprise or campus networks.

• Unified Messaging: Underpins solutions that integrate multiple message types (voice, fax, email) by signalling waiting messages across exchanges.

• Multi-Site Enterprise PBXs: Ensures interoperability and consistent feature delivery when connecting PBXs across geographically dispersed locations via QSIG.

• Service Providers and Vendors: Enables telecommunication solution providers to demonstrate compliance for their systems and components, supporting tenders and procurement in both public and private sectors.

By standardizing how message waiting indications are signalled, this standard ensures a seamless user experience and reliable system integration.

Related Standards

For complete implementation and compliance with PISN and MWI supplementary services, the following related standards are referenced and relevant:

• EN 301 260: Functional models and information flows for MWI supplementary service.
• ETS 300 239: Generic functional protocol for supplementary services in PISN.
• ETS 300 257: Diversion supplementary services protocol in PISN.
• ETS 300 387: Methods for the specification of basic and supplementary services in private telecommunication networks.
• ETS 300 475-1: Reference configuration for Private Telecommunication Network exchanges (PTNX).

These standards, together with SIST EN 301 255 V1.1.1:2005, form a comprehensive suite for the development, deployment, and maintenance of advanced integrated telephony systems, ensuring compatibility and reliability in modern digital communication networks.

Keywords: PISN, QSIG, message waiting indication, MWI, inter-exchange signalling, voicemail notification, private networks, supplementary services, digital telephone networks.