ldapsearch with telephoneNumber

[Rocío Walias <mrwm@tid.es>]

Hello,

    I'm trying to search telephoneNumber greater than others, then I use a
filter like:
                    telephoneNumber'>=' 983222222

        but there's no response, am I using a bad search filter? or is no
possible to compare telephoneNumbers?

Thank you

    Rocío Walias