call(A voice session that can be conducted between two or more telephones, two or more devices (such as computers or smartphones), or between two or more such devices and telephones); conversation(A real-time communication session between two or more users. A session can involve IM, video, or audio)
Chats(A label for a tab that has a list of conversations for all methods (modalities) of communication, such as voice call or instant message, for past and present)
