A system and method is presented for reducing a concentration of ambient air used in a feed stream to form an inerting gas in a pressure swing adsorption system. The radiotelephone automatically calls a central voice-activated phone dialing system remote from the portable radiotelephone in response to producing the second condition in the radiotelephone. The server receives the compression-encoded speech parameters, a speech processing unit makes speech recognition of the compression-encoded speech parameters, and sends information corresponding to the speech recognition result to the client.