Overview
SIST ETS 300 260 E1:2005 specifies the stage 1 and stage 2 requirements for the Call Transfer supplementary service (SS-CT) for Private Telecommunication Networks (PTN). Developed and maintained by the Slovenski inštitut za standardizacijo (SIST) and closely aligned with ECMA and ETSI standards, this document outlines service functionality, key information flows, and the associated functional models. Its scope is based on concepts and recommendations from international telecommunications and open systems bodies, ensuring compatibility with both public ISDN and private network environments.
By defining how call transfer services should function and interact within PTNs, SIST ETS 300 260 E1:2005 supports interoperability, seamless user experiences, and the integration of robust supplementary services in enterprise communication networks.
Key Topics
- Call Transfer Supplementary Service (SS-CT): Specifies the procedures allowing a user to transform two active calls into a single connection between the other endpoints.
- Stage 1 and Stage 2 Descriptions:
- Stage 1: Focuses on service definition as perceived by end users of a PTN.
- Stage 2: Identifies required network functional entities and models the flows of information between them for service realisation.
- Methods of Call Transfer:
- Transfer by Join: Joins two existing calls at the PTN exchange, releasing the initiating user.
- Transfer by Rerouting: Establishes a new connection for the remaining participants, optimizing network resource use where possible.
- Interaction with Other Services: Outlines compatibility and interactions with supplementary services such as Calling Line Identification, Call Forwarding, and Name Presentation/Restriction.
- Network Interworking: Ensures the service is applicable across multiple network types, including ISDN and non-ISDN, public and private environments.
Applications
SIST ETS 300 260 E1:2005 is vital for:
- Private Network Operators and Service Providers:
- Enables the deployment of standardized, reliable call transfer functions.
- Supports advanced telephony features expected in modern office or enterprise environments.
- Equipment Manufacturers:
- Provides a reference model for implementing compliant PBX, switch, and terminal equipment.
- Assists in developing interoperable devices that conform to European and international call transfer requirements.
- System Integrators:
- Facilitates seamless integration of PTN components, promoting compatibility among products from various vendors.
- Supports the design and installation of scalable and flexible corporate telecommunication infrastructures.
- Network Administrators:
- Ensures that user-facing and backend transfer operations adhere to standardized procedures for a consistent experience.
- Provides guidance on handling exceptions and ensuring proper service interactions and restrictions (e.g., CUG policies).
Related Standards
Implementers should also consult the following related standards and recommendations for comprehensive compliance and system design:
- ISO/IEC 13865: International specification for call transfer in PTNs (basis for this modified standard).
- ECMA DTR/ECMA-0002 (ECMA-TR/SVC): Reference for explicit call transfer supplementary service.
- ETS 300 171: Defines basic services and control models for PTNs.
- ETS 300 173/237: Supplements for identification and name presentation services.
- ENV 41005: Guidance on the three-stage service specification method.
- CCITT Recommendations I.252, I.210, I.112, Z.100: International vocabulary, service frameworks, and SDL modeling instructions for ISDN and telecommunication services.
Practical Value
Adopting SIST ETS 300 260 E1:2005 ensures that private telecommunication networks:
- Deliver standardized and interoperable call transfer services.
- Benefit from consistent and predictable user experiences across diverse PTN architectures.
- Ensure future-proofing by aligning with broader European and international telecommunications standards.
Enterprises and service providers seeking to deploy or modernize PTN solutions will find this standard an essential foundation for supporting advanced call management and maintaining compliance with global best practices.
