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High expense of satellite channels along with providing telephony services for rural regions makes us to propose a new medium access control (MAC) protocol for sending signaling of telephony traffic via geo stationary satellite with narrow bandwidth channels. This paper explores an efficient MAC protocol, slot reservation demand assignment multiple access (SRDAMA), and also examines its performance via ns-2.31 simulator. It is notable that for simulation of this scheme some changes has been made to C++ codes of ns-2.31. To best of our knowledge no previous work has studied the problem of transmitting telephony traffic signaling over narrow bandwidth geo satellite channel.