Problem solved. It was the default data in the phone number fields, coming from the 3rd party application. The default data in the empty fields looked like (___)___-____ Ex.____, and every phone number had Ex.___ after it. This was transferred into Outlook, and then into the Blackberry, though it was not visible.. For whatever reason, the Blackberry interpreted it as a 3.
Doing some testing, I deleted the Ex.___ after the number in Outlook, saved it, re-synchronized, and the number dialed fine from the Blackberry.
Hope this helps.