1. A method for determining call center resource allocation, comprising: modeling call center performance over an operations time period using a computer; simulating, using the computer, a number of replicas of the modeled call center performance over a planning time period, each replica having random contact arrivals and contact service times following a stochastic arrival and service process according to probability distributions of inter-arrival time and service time; running, on the computer, multiple iterations of each simulation to optimize call center resource allocation; testing a particular simulation iteration against a criterion of convergence; and allocating call center resource based on the particular simulation iteration with a successful criterion of convergence.