A device establishes a first communication session with an endpoint and is configured to perform the first session via one of two different call configurations. In response to unplanned termination of the first session, the device identifies a specific call terminating condition and determines when the call terminating condition is within a first subset of call terminating conditions. Then, in response, the device: creates a record of the first session, including information identifying the established call configuration; and activates a timer associated with the record. The device then autonomously accepts a request to establish a second communication session from an endpoint and implements the same call configuration for the second session, in response to the request (a) being received before expiration of the timer and (b) establishing the second session between the communication device and the same endpoint. With a Push-to-Talk call, the established call configuration is full duplex mode.