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Push-To-Talk can be viewed as an Instant Messaging service, enhanced with voice functionality. Most of the related work available today focuses on the performance analysis over PoC. However, they seemed to be completely ignorant about dimensioning PoC controller to optimize revenue for service providers. The contribution of this proposed work is as follows: 1. Provide access priority to special sessions based on available TRUs (Transmit/Receive Unit); 2. Optimize the session timer for a PoC controller; 3. Optimize number of session initiation for a PoC client during busy hour. We propose to dimension the PoC controller based on the assumption that the network grade of service is provided. This way a PoC server is able to control PoC functionalities to the optimal level.