listener service register

alter system set local_listener='(ADDRESS = (PROTOCOL = TCP)(HOST = demo.localdomain)(PORT = 1531))';

alter system set local_listener='(ADDRESS = (PROTOCOL = TCP)(HOST = demo.localdomain)(PORT = 1531))','(ADDRESS = (PROTOCOL = TCP)(HOST = demo.localdomain)(PORT = 1522))' scope=both;

stop and start the listener

lsnrctl status LISTENR.