Hi! I know how you can do it
In addition to Ilya Ruprecht actions we need to edit next files in program/steps/addressbook:
show.inc
save.inc
edit.inc
Find and edit variable
$a_show_cols = array('name', 'firstname', 'surname', 'email', 'phone', 'title', 'company');
like that.
Don't forget to add keys in main.inc.php like
'phone_field' => 'telephoneNumber',
'title_field' => 'title',
'company_field' => 'o',
and to labels.inc -
$labels['phone'] = 'Telephone';
$labels['title'] = 'Dolzhnost';
$labels['company'] = 'Company';