Start with the exclusions
Honor contact restrictions, requests to stop, clear declines, and already resolved decisions. Check the validity of the estimate and whether the shop can still deliver the proposed work.
Use the customer’s context
A requested callback, an unanswered technical question, and silence after multiple attempts justify different decisions. Follow the shop’s authorized contact rules and agreed stopping conditions. A high quote value is not permission to keep calling.
Make the queue explainable
For each item, the responsible person should be able to state why it is active, what action is due, and when it stops. Keep unknowns visible and review the result of the action before scheduling another.