A customer has deployed a Communication Server (CS) 1000 RIs. 7 x system at their site. They have asked you if the CS 1000 has a feature that can extend and ring calls to other locations. You have decided that Personal Call Assistant (PCA) will meet the customer's requirements and verified that the system is equipped with Package 398, and that it has sufficient ISM parameters. Which step must be performed first when implementing PCA?