retrieving entries

["Mclean, Patrick" <Patrick.Mclean@dsto.defence.gov.au>]

Can anyone please tell me if they know if it possible to retreive entries
from a directory without specifying the entries distinguished name.  For
example is it possible for an application using a base branch within a
directory to retrieve for example all the phone numbers for the entries in
that branch.  So all the entries phone numbers are retrieved and the
application is only given the starting point in the directory and the
attribute phone number.
PM