Overview
SIST EN 301 907 V1.1.1:2005 specifies the standardized requirements for signalling interworking between QSIG and H.323 in corporate telecommunication networks (CN), with a focus on the call transfer supplementary service. Endorsing and adapting ISO/IEC 21410:2001, this standard addresses a critical need for seamless integration between traditional Private Integrated Services Networks (PISN) using QSIG and modern packet-based networks utilizing the H.323 protocol suite. This enables the consistent provision of advanced call management features, such as call transfer, across heterogeneous network infrastructures.
Corporate networks often require interoperability between legacy systems and IP-based solutions. By defining signalling protocol compatibility for call transfer functionality, SIST EN 301 907 V1.1.1:2005 supports efficient migration paths and unified communications environments for enterprises of all sizes.
Key Topics
- Signalling Interworking: The standard details the interworking mechanisms required for the call transfer supplementary service when traversing between QSIG-based PISN and H.323-based IP networks.
- Call Transfer Supplementary Service: It ensures that the process of transferring calls between users on different networks is handled securely, reliably, and consistently, regardless of the underlying signalling protocol.
- Reference Alignment: The standard modifies and harmonises references from ISO/IEC standards to corresponding European Norms (EN), ensuring regional adaptation and compliance.
- Private Integrated Services Networks (PISN): PISN are traditionally QSIG-based systems typically deployed within large organizations for unified communication.
- H.323 Protocol Suite: Widely used for multimedia communication over packet-switched networks, H.323 forms the basis for VoIP and video telephony services in enterprise environments.
Applications
SIST EN 301 907 V1.1.1:2005 offers significant practical value for organizations migrating from traditional telephony to IP-based communications, or those needing to maintain a hybrid communication infrastructure:
- Enterprise Telecommunication Networks: Enables seamless call transfer between different parts of a corporate network-whether circuit-switched or packet-switched-promoting higher productivity and streamlined workflows.
- Unified Communications: Supports the implementation of unified communication solutions by bridging protocol gaps, allowing end-users to experience consistent telephony features across all platforms.
- Systems Integration: Facilitates integration projects involving legacy PBX (QSIG/PISN) and modern IP-PBX (H.323) installations, reducing complexity and vendor lock-in.
- Service Providers and Solution Vendors: Allows service providers to offer value-added services that cater to businesses with mixed network environments, ensuring compliance with recognized European and international standards.
Related Standards
Organizations implementing or referencing SIST EN 301 907 V1.1.1:2005 should be aware of the following related standards for comprehensive network architecture and interoperability:
- EN 300 172: Inter-exchange signalling protocol for PISN circuit-mode basic services.
- ETS 300 475-1: Reference configuration for private telecommunication network exchanges.
- EN 300 239: Generic functional protocol support for PISN supplementary services.
- EN 300 261: Call transfer supplementary service protocol for PISN.
- EN 301 919: Single step call transfer supplementary service protocol for PISN.
- TS 101 905: Generic functional protocol for supplementary services interworking between QSIG and H.323.
Compliance with these standards ensures robust interoperability and future readiness for advanced corporate telecommunication requirements, supporting both legacy and next-generation network deployments.
Keywords: corporate telecommunication networks, QSIG, H.323, signalling interworking, call transfer, supplementary services, PISN, VoIP, unified communications, ISO/IEC 21410, SIST, ETSI.
