file.c

			if (!fr) {
#if 0
				ast_log(LOG_DEBUG, "Got hung up\n");
#endif
				return -1;
			}
			
			switch(fr->frametype) {
			case AST_FRAME_DTMF:
				res = fr->subclass;
				if (strchr(breakon, res)) {
					ast_frfree(fr);
					return res;
				}
				break;
			case AST_FRAME_CONTROL:
				switch(fr->subclass) {
				case AST_CONTROL_HANGUP:
					ast_frfree(fr);
					return -1;
				case AST_CONTROL_RINGING:
				case AST_CONTROL_ANSWER:
					/* Unimportant */
					break;
				default:
					ast_log(LOG_WARNING, "Unexpected control subclass '%d'\n", fr->subclass);
				}
			case AST_FRAME_VOICE:
				/* Write audio if appropriate */
				if (audiofd > -1)
					write(audiofd, fr->data, fr->datalen);
			}
			/* Ignore */
			ast_frfree(fr);
		}
		ast_sched_runq(c->sched);
	
		
	}
	return (c->_softhangup ? -1 : 0);
}