Page 1633 of 1814International ISDN PRI Feature description and administration1640Virtual Network Services VirtualDirectory Number ExpansionContentsThe following are the topics in this section:Feature description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1633Operating parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1634Feature interactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1634Feature packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1634Feature implementation . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1635Task summary list . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1635Feature operation . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1639Feature descriptionVirtual Network Services (VNS) provides ISDN features to customers whenno ISDN Primary Rate Interface (PRI) or ISDN Signaling Link (ISL) BearerChannels are available between two Meridian 1 switches. (Refer to the VNSfeature description module in this NTP for detailed information on VNS).You must configure VNS DNs (VDNs) as part of the numbering plan. TheVNS VDN expansion feature sets a new limit on the number of VDNs at4000. VDNs are configured on Overlay 79.The VDNs are defined in sets of blocks. Each block may contain any numberof contiguous VDNs, as long as the total number does not exceed 4000.Within a block, it is possible to define a range of VDNs as well as individualVDNs.
