This Recommendation describes the interworking arrangements between PSPDNs and private data networks for the provision of data transmission services. These interworking arrangements include the capabilities required to support the network service for Open Systems Interconnection for ITU-T applications as described in Recommendation X.213. The current Recommendation has taken into account the market demand for the PSPDN to provide the gateway function allowing interconnection on a peer-to-peer basis between the public and private network.