ISO/IEC ISP 10613-7:1994

This ISP is applicable to interworking units concerned with operating in the open systems interconnection (OSI) environment. It specifies a combination of OSI base standards that collectively provide a network relay function for the connectionless-mode network service. This part specifies requirements that are applicable to an interworking unit using virtual calls over a permanent access to a PSDN. Applies only to communications using PSDN subnetworks with permanent access on which virtual calls are used.