Overview
SIST EN 300 256 V1.3.1:2005 specifies the functional models and information flows for call diversion supplementary services in Private Integrated Services Networks (PISN). Based on the modified ISO/IEC 13872 (2003), this European standard details the requirements and processes for implementing call forwarding and call deflection services in private telecommunication environments. Maintained under the authority of SIST and ETSI, the standard integrates corrections, ASN.1 migration, and updated procedures for delayed sending of DiversionLeg1.
These specifications facilitate interoperable communication within PISNs, supporting enterprise telephony systems with comprehensive call management features.
Key Topics
- Call Diversion Services: The document details procedures and information flows for multiple call diversion supplementary services:
- Call Forwarding Unconditional (SS-CFU)
- Call Forwarding Busy (SS-CFB)
- Call Forwarding No Reply (SS-CFNR)
- Call Deflection (SS-CD)
- Functional Models: Comprehensive models illustrate how supplementary services fit into overall PISN architecture, ensuring consistency with ISDN and Open Systems Interconnection (OSI) frameworks.
- Information Flows: Clear descriptions and diagrams support accurate implementation of signaling and message exchanges required for call diversion between network elements.
- Protocol Alignment: Harmonizes with existing telecommunication standards, supporting seamless integration and migration, particularly through ASN.1 notation and new diversion procedures.
- Error Correction and Updates: Incorporates errata corrections from earlier versions for improved reliability and incorporates changes from both the European and international standards bodies.
Applications
This standard is essential for:
- Enterprise PBX Systems: Enables advanced call routing, ensuring that calls are effectively forwarded or deflected based on user status or preferences, boosting organizational communication efficiency.
- Service Providers: Telecommunications operators integrating PISN capabilities can implement standardized call management features across diverse platforms.
- Network Equipment Manufacturers: Guides the design and development of compliant telephony solutions to deliver value-added services and interoperability with other systems.
- IT and Network Integrators: Facilitates deployment and configuration of PISN-based infrastructures within complex corporate environments by defining interoperable call diversion protocols.
Adoption of SIST EN 300 256 V1.3.1:2005 streamlines the management of incoming and outgoing calls, reduces operational bottlenecks, and enables flexible telecommunications within organizations.
Related Standards
Professionals implementing or referencing this standard may also require knowledge of related PISN and telecommunication standards, such as:
- ETSI EN 300 189: Private Integrated Services Network (PISN); Addressing [ISO/IEC 11571, modified]
- ETSI EN 300 171: PISN; Service description, functional capabilities and information flows; Circuit-mode 64 kbit/s bearer services [ISO/IEC 11574, modified]
- ETSI ETS 300 475-1: PTN; Reference configuration for PTN exchanges [ISO/IEC 11579-1, modified]
- ETSI EN 300 237: PISN; Specification, functional model and information flows; Name identification supplementary services [ISO/IEC 13864, modified]
- ETSI ETS 300 173: PISN; Specification, functional models and information flows; Identification supplementary services
Familiarity with these complementary standards ensures robust, interoperable telephony solutions in line with current European and international best practices.
SIST EN 300 256 V1.3.1:2005 provides a critical foundation for advanced call handling and network reliability in modern private telecommunication environments.
