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C/C-ISO/IEC ISP 10614-4-99 (R2008)
This part of ISO/IEC ISP 10614 specifies subnetwork-dependent, media-dependent requirements applicable to an interworking unit using virtual calls over a permanent access to a PSDN. The operation of an interworking unit may involve relaying from one subnetwork to another, and those subnetworks need not be of the same type. This part of ISO/IEC 10614 applies only to communications using PSDN subnetworks with permanent access on which virtual calls are used.