EmpathyTpChat @empathytpchat: the object which received the signal. @arg1: @arg2: @empathytpchat: the object which received the signal. @empathytpchat: the object which received the signal. @arg1: @empathytpchat: the object which received the signal. @arg1: @arg2: @account: @tp_chan: @Returns: @contact: @Returns: @chat: @Returns: @chat: @acknowledge: @chat: @Returns: @chat: @Returns: @chat: @message: @chat: @state: @chat: @Returns: