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Number Processing in the SRI-ACK Flow

Number processing in the SRI-ACK flow refers to a process of number change or number normalization on the numbers carried in the SRI-ACK message that is sent from the HLR to the MSC.
Figure 1 Flowchart

NOTE:
The mandatory tables for querying are highlighted by solid-line frames and the optional tables are highlighted by dotted-line frames.detail:
In the table querying flow, pay attention to the following items:
  • DN set modification of international MSRN: If a number is an international MSRN, the system modifies its DN set based on the value of bits 0-7 of P97. Thus, different number analysis data can be configured for the international MSRN based on the modified DN set.
  • MSRN normalization: For details, see MSRN Normalization.

Table Description

Table Name Command Input Parameter Output Parameter Function Description
Subscriber Integrated Services Information table ADD USRVPROC
  • Function
  • Call originator
  • Call prefix
  • Service check type
  • Enhanced category
  • Supplementary service code
  • Caller number change name
  • Called number change name
  • Failure source name
  • Processing type
 Based on the function type, call originator and call prefix, the MSOFTX3000 queries the Subscriber Integrated Services Information table to perform calling or called number change or failure processing.
This table is queried twice in the SRI-ACK flow:
  • This table is queried for the first time when an SRI-ACK message carries the enhanced category registered by the callee.
  • This table is queried for the second time when an SRI-ACK message carries the supplementary service code registered by the callee.
Call Prefix Processing table ADD PFXPRO
  • Call source name
  • Call originator
  • DN set
  • Call prefix
  • New DN set
  • Called number change name
  • Caller number change name
  • Tone playing mode
  • Processing type
 This table is used to perform special processing on certain call prefixes, including calling and called number change, tone playing, failure processing, number re-analysis after number change, and N-CSI DP2 triggering.
If the callee does not register the TCSI, the MSOFTX3000 queries the Call Prefix Processing table in the SRI-ACK flow to trigger the N-CSI DP2.
In the core procedure of number analysis, the MSOFTX3000 queries the Call Prefix Processing table to trigger function except the N-CSI DP2.