We have 3 small locations (all w/out consoles-using 6400 series phones & expansion modules) and all 3 are international...when we call an unassigned # in those offices, we are getting different things-London will get dead air and Shanghai will hear a recording from the local provider that # is invalid. Once we set up the ext., it rings in. Can't we set this up so all #s ring into the main line? It works that way in the U.S., but we have consoles and LDNs...if that matters.