The following section is only applicable to the DSC Platform.
Using a configurable Gateway Redirection criteria, such as SCCP Called Party Address (CLD) digits with a prefix of 1 and TCAP SendRoutingInfoForSM (SRI-for-SM) Begin message, an Message Signaling Unit (MSU) is redirected to the INAPGW application. This application initiates a corresponding INAP Initial-Detection Point (DP) query to a specific external NP database using the received SCCP CLD digits. Based on the response (INAP Connect or Continue), the intercepted MSU with an updated SCCP CLD is GT-routed to its partners where applicable or else to a default hub through a custom GTT DB.
The INAP response updates the intercepted MSU’s SCCP CLD digits for custom GT routing as follows:
GTT strips any added routing prefix before forwarding the original MSU.
Consider the following for the preceding figure:
The local NPs are optional. Customer deployment may use only the INAP Gateway solution as an intercept to a national database (for example, in North America) and maintain their existing NP databases (for example, in their European network).
The SS7 database application NP must be licensed to support NP in DSC Platform.