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OMNET++ provides a framework for simulating various queuing models such as M/M/c/c using the discrete event simulation methodology. The following steps can be taken to simulate M/M/c/c using OMNET++:

1. Define the system model using OMNET++ module hierarchy.
2. Define the simulation inputs such as arrival rate, service time, and number of servers.
3. Implement an event scheduler to simulate the arrival and departure processes.
4. Generate random arrivals and departures based on the M/M/c/c probability distributions.
5. Calculate the system performance metrics such as the average number of customers in the system, average waiting time, and utilization.
6. Conduct sensitivity analyses by changing the arrival rate and service time to evaluate the system behavior under different scenarios.

Overall, OMNET++ provides a versatile tool for simulating complex queuing models such as M/M/c/c, which can help researchers and practitioners to optimize system performance and design better queuing systems for various applications.