code: public PhoneNumberProvisioningManager get() {
          PhoneNumberProvisioningManager manager = (PhoneNumberProvisioningManager) context.getAttribute("PhoneNumberProvisioningManager");
          if (manager != null) // ok, it's already in the context. Return it
              return manager;
          manager = create();
          // put it into the context for next time that is requested
          context.setAttribute("PhoneNumberProvisioningManager", manager);
          return manager;
      }
docs: Tries to retrieve the manager from the Servlet context. If it's not there it creates is, stores it
  in the context and also returns it.
  
  @param context
  @return