A method and system for parsing a markup language document are disclosed in the invention. The heating device is configured to switch the conductivity of a transformable portion of the PCM between a lower resistance crystalline state and a higher resistance amorphous state. Once the called terminal is ready to accept the call, instead of the call acceptance response, a reverse call establishment request for the call is received back from the called terminal. Mobile stations responding to the request, use specific resources corresponding to respective range values.