Providing session-based services to event-based networks using partial information

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, an incomplete subset of the events related to the call, to generate at least one emulated communication session in the packet-switched network based on the incomplete subset of the events, and, using the emulated session, to cause a service platform in the packet-switched network to provide a communication service to the call conducted in the circuit-switched network.