特殊用法call [called] subscriber1.主[被]叫用户direct line subscriber1.直达线用户extension subscriber1.分机用户individual line subscriber1.专线用户message rate subscriber1.根据通话次数计费的用户originating subscriber1.发端呼叫者overseas subscribers1.国外(期刊)订阅户party line subscriber1.同线户remote subscriber1.【信】远距离用户telephone subscriber1.电话用户terminating subscriber1.被呼唤用户