Virtual Network Services Page 1657 of 1814International ISDN PRI Feature description and administrationEuroISDN Trunk - Network SideVirtual Network Services is supported on a EuroISDN Trunk - Network Sideconnectivity, meaning that a EuroISDN Trunk - Network Side trunk can beused as a VNS bearer trunk.Incoming Digit ConversionSince VNS Virtual DNs must be received on the incoming VNS Bearer (DID)trunks, as they are defined at the terminating node, the VNS feature is notsupported for routes that perform digit conversion on the digits used for VNSVirtual DNs.ISDN Call Connection Limitation (ICCL) ChecksThe VNS trunk from the external network looks exactly like an ISDN TIEtrunk and accordingly is subject to ICCL checks and call restrictions appliedthereon.ISDN PRI/BRI Meridian 1 to Asia Pacific ConnectivityIt is not possible to configure an Asia Pacific D-channel as a VNS D-channel.However, the voice connection through the Public Exchange of a VNS callmay use a PRI/BRI COT or DID as a virtual TIE trunk.ISDN QSIG Basic CallA QSIG link can be used as a B-channel for the Virtual Network Service(VNS) over a private network. All VNS services are supported as normal.QSIG is only used as a speech bearer.Intercept TreatmentIntercept treatment applied to VNS calls is configured as for TIE trunks.Network ACDNetwork ACD (NACD) is supported by VNS. When a call queued at a sourcenode receives notification that an agent is free and reserved at the target node,a VNS call is made to the target node. At that time, the call is removed fromthe queue at the source node. The call will continue to receive ringback (orRecorded Announcement (RAN) if configured) while it is waiting for theVNS call to be completed. When an alerting message is received from thetarget node, the ringback or RAN is removed and the speechpath with theBearer is connected. The user will thus hear ringback tone (given either by thePSTN or the Meridian 1 at the target node, depending on the Bearer type),until the agent answers the call.
