I tried Company Directory, and it worked for me. The procedure is a bit clunky, as you need to do the following in order to call a contact in the company directory: 1. Select Contacts 2. Select All Contacts menu 3. Select Import contacts 4. Select Import Mail for Exchange contacts 5. Enter name 6. Select Search 7. Select desired name 8. Select Import 9. Search the just imported name from all contacts 10. Select the just imported contact 11. Select the phone number you want to call