Upon request of defense counsel, the district attorney shall furnish to defense counsel as an officer of the court, in confidence, the addresses and telephone numbers of the states witnesses to the extent such are within the knowledge of the district attorney, unless for good cause the judge allows an exception to this requirement, in which event defense counsel shall be afforded an opportunity to interview such witnesses prior to the witness being called to testify.
Ga. R. Super. Ct. 30.3