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A system and method for enforcing policies for session-mode messaging between two or more communication devices. A policy is imposed by a signaling-level session control element on a communication device to establish a bearer-level binding between the communication device and bearer-level relay. A state of the bearer-level binding is determined, which is provided to the signaling-level session control element. The signaling-level session control element allows or disallows the first communication device to engage in the session-mode messaging based on the state of the bearer-level binding.