Extention name in outbound calls

i have SPA504G cisco . i did
not configure any personal directory

when i receive a call from
internal ext it show the name of the ext as configured in the Freepbx . but
when i dial the ext it show only the Ext Number .

so , how can i force the
phone to query the Ext Name from the Freepbx when i place calls internally . without using the personal directory ?