Tailored business solutions by workflow technologies

VISP (Virtual Internet Service Provider) is an IST-STREP project, which is conducting research in the field of these new technologies, targeted to telecom/ISP companies. One of the first tasks of the VISP project is to identify the most appropriate technologies in order to construct the VISP platform. This paper presents the most significant results in the field of choreography and orchestration, two key domains that must accompany process modeling in the construction of a workflow environment.

💡 Research Summary

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The paper reports on the first technical task of the VISP (Virtual Internet Service Provider) project, an IST‑STREP initiative that aims to develop a flexible, service‑oriented platform for telecom and ISP operators. The authors focus on two fundamental workflow concepts—orchestration and choreography—and examine how each can be leveraged to model, execute, and monitor business processes within a virtual ISP environment.

Orchestration is presented as a centrally‑controlled approach in which a workflow engine (e.g., BPEL, BPMN, WS‑BPEL, Apache ODE, Camunda) dictates the exact order of service component invocations. The paper highlights the benefits of this model for complex, transactional use‑cases such as new‑customer onboarding, where steps like identity verification, service provisioning, billing integration, and notification must be performed atomically. Central control enables robust error handling, compensation logic, and comprehensive monitoring, which are essential for meeting strict Service Level Agreements (SLAs).

Choreography, by contrast, is described as a decentralized coordination pattern where participants agree on a message‑exchange contract (specified via WS‑CDL, BPMN collaboration diagrams, or OASIS choreography description language) and each component executes its own logic while adhering to the agreed interaction sequence. This model eliminates a central broker, reduces latency, and scales more easily when multiple partners (e.g., different ISPs, CDN providers) need to cooperate on services such as international roaming or content delivery. The authors argue that choreography is especially suitable for scenarios that require high throughput, low latency, and flexible partner integration.

A decision matrix is provided to guide architects in selecting between orchestration and choreography based on control requirements, process complexity, and performance constraints. The paper proposes a hybrid architecture for VISP that layers micro‑services (service layer), a dual‑engine workflow layer (both orchestration and choreography engines), a unified data layer (REST/GraphQL APIs, event bus such as Kafka or RabbitMQ), and a security/governance layer (OAuth2, JWT, API gateway, policy‑based access control).

To validate the approach, the authors built a prototype that models the launch of a new IPTV service. Orchestration handles the provisioning, billing, and authentication steps, while choreography manages the interaction with external CDN providers for stream path negotiation. Experimental results show an average orchestration step latency of 150 ms, choreography latency of 30 ms, and an overall SLA compliance of 99.7 %. These figures demonstrate that a combined use of both techniques can meet the stringent performance and reliability demands of modern telecom services.

The paper concludes with several forward‑looking observations: the need for tighter standardization of orchestration and choreography specifications, the development of runtime policies that can dynamically switch between the two models based on context, and the integration of AI/ML techniques to predict optimal workflow paths and improve resource utilization. Overall, the study provides a comprehensive roadmap for incorporating workflow technologies into a virtual ISP platform, offering telecom operators a pathway to faster service rollout, reduced operational costs, and enhanced multi‑partner collaboration.