What feature does IPO offer for managing multiple calls at once?

Call waiting is a feature that allows a user to manage multiple calls simultaneously. When a user is already on a call and receives another incoming call, the call waiting feature alerts them of the new call, typically through a tone or visual signal on their phone. The user can then choose to place the first call on hold and answer the new incoming call, or they can reject the new call and continue with the current conversation.

In contrast, call forwarding directs incoming calls to another line or phone number and is not designed specifically for managing multiple active calls. Conference calling enables multiple parties to participate in a single call but requires active management of the calls being connected, making it more complex than simply handling incoming calls. Voicemail management deals with storing and retrieving voice messages and does not involve real-time call management. Thus, call waiting stands out as the primary feature that directly facilitates handling multiple calls concurrently.