The party being called has several options when hearing the call waiting sound indicating a new incoming call. They can answer, ignore or reject the second call. To answer the second call, they will need to decide what to do with the call they are on. It can be ended or placed on hold using the functions consultation, hold and toggle. Some networks also allow you to answer the new call and use three-way calling.
Whether the call waiting function can be enabled depends on several factors. Both the telephone network and the devices must support this function. When using telephone systems, they must also be compatible with call waiting. In addition to Integrated Services for Digital Network (ISDN) and Voice over IP telephony (VoIP), call waiting is also available on many cell phone networks.
On many telephone networks call waiting can be enabled by dialing * 4 3 #. Dialing # 4 3 # will then disable call waiting. After entering this code you will typically hear a message from the provider. To check if call waiting is enabled, dial * # 4 3 #.