N2 DSG-SCP

Overview

The DSG-SCP Application is responsible for handling CAMEL/INAP call-session control under the direction of a Diameter-capable Online Charging Server (OCS). Communication with the OCS is via an N2SVCD DiameterApp which manages the Diameter transport layer. Communication with the CAMEL Mobile Switching Centre (MSC) or INAP Service Switching Point (SSP) is via an N2SVCD SigtranApp which manages the TCAP/SIGTRAN transport layer.

Interaction may also include announcements with the support of an INAP-capable Specialized Resource Function (SRF) either on-switch using the INAP/CAMEL ConnectToResource (CTR) operation or external using the INAP/CAMEL EstablishTemporaryResource (ETC) operation.

N2SVCD Components

When deploying the N2DSG-SCP product, the DsgScpApp (Diameter/CAMEL Gateway) application is used in conjunction with other components as shown in the following component deployment diagram:

• Alarms and Statistics may be sent by the various applications.
• The EdrApp, ManageApp, WatchdogApp provide core service functions.
• The SigtranApp provides the SIGTRAN connectivity to the signalling network.
• The DsgScpApp handles CAMEL/INAP InitialDP operations from the network (including SRF).
• The DiameterApp is used for real-time charging integration with the OCS node.
• The SmppApp may be used for sending SMS notifications to the handset.

Note that the DSG-SCP will typically use a an on-switch or external Specialized Resource Function (SRF) to perform audio announcements and/or to collect DTMF input.

All interaction between the N2SCP and the SRF components is performed via the SigtranApp over an SCTP/SIGTRAN link.

See also the general product page for the N2 DSG-SCP.

Subscriber Selection

For each traffic type, the value of the subscriber MSISDN for insertion into the Diameter Subscription-Id → Subscription-Id-Data and/or Subscription-Id-Extension AVPs is set from the InitialDP as follows:

• Originating: set from normalised InitialDP → callingPartyNumber.
• Forwarding: set from normalised InitialDP → redirectingPartyID.
• Terminating: set from normalised InitialDP → calledPartyNumber.

Refer to the DSG-SCP configuration for further details.