Providing session-based service orchestration to event-based networks

A mediation system, comprising:

• a first interface for communicating with a circuit-switched network, which operates in accordance with a first communication protocol that manages calls by exchanging discrete events among elements of the circuit-switched network;
• a second interface for communicating with a packet-switched network that operates in accordance with a second communication protocol;
• and
• a processor, which is configured to receive from the circuit-switched network, during a call conducted among two or more subscribers in the circuit-switched network, a sequence of the events related to the call, to generate at least one emulated communication session in the packet-switched network based on the sequence of the events, and to provide multiple call services to the call conducted in the circuit-switched network from the packet-switched network by cascading multiple service sessions, each providing a respective one of the call services, in the packet-switched network responsively to the emulated communication session.