A symmetrical accounting method and apparatus uses a DSA agent within each node of a computer network. The outermost hoop section or flange includes a projecting horizontal shelf extending partially around the lid. When a real-time service application is executed on the terminal device, and an SIP request packet or an SIP response packet is filtered and input, QoS parameters are extracted from the SIP request packet or the SIP response packet. A signal is output from the host computer to the interface device to apply a force sensation to the physical object using one or more actuators.