An approach for simulating a telephony system to enable the evaluation of rules employed by the system for routing inbound calls to representatives is described. A simulation manager receives call production data, representative production data, or a combination thereof as generated by a telephony system during a production run for directing one or more inbound calls to one or more representatives. The simulation manager also generates an expected call handling response of the telephony system during a subsequent production run due to (a) one or more subsequent inbound calls, (b) a change associated with the one or more representatives, (c) a change associated with the call handling rules, or (d) a combination thereof based on execution of a simulation of the execution of the telephony system.