if (ready_chan) {
                        if (!(frame = ast_read(chan))) {
                                /* the channel is probably gone, so lets stop polling on it and let the
                                 * FAX session complete before we exit the application.  if needed,
                                 * send the FAX stack silence so the modems can finish their session without
                                 * any problems */
                                ast_debug(1, "Channel '%s' did not return a frame; probably hung up.\n", chan->name);
                                GENERIC_FAX_EXEC_SET_VARS(fax, chan, "HANGUP", "remote channel hungup");
                                c = NULL;
                                chancount = 0;
                                timeout -= (1000 - ms);
                                fax->tech->cancel_session(fax);
                                if (fax->tech->generate_silence) {
                                        fax->tech->generate_silence(fax);
                                }
                                continue;