A method is provided for enabling a customer to activate a call waiting feature for a list of caller numbers specified by the user. Calls from numbers on the list generate call waiting tones if they call while the customer is talking to someone. Other callers will hear a busy signal or may be routed to voicemail. The customer can activate the feature and add numbers to, or can remove numbers from, the list by entering one or more codes and interacting with prompts from a network server to enter the numbers to be added or deleted. A method for administering the feature on the network can include administering user charges for activating and maintaining the feature and deleting a number from the list when the user receives a call from the number.