2.6.5 TIF Selective Screening Feature
- The CdPN that is found in the Number Portability is Blocklisted; the CdPN has CdBL flag = YES.
- The CdPN is not found in Number Portability.
- The CdPN begins with a specific prefix.
- The Called Party is screened by TIF Selective Screening and the Release cause is not NONE.
Three Service Action Data (SA Data) values can be associated with provisioned TIF Selective Screening Service Actions to provide configurable Release Cause values for the Blocklist scenarios. The SAxVAL[1] value is used to indicate the Release Cause for ANSI ISUP; the SAxVAL[2] value is used to indicate the Release Cause for ITU ISUP. The SAxDGTS parameter indicates the Call Type for CdPNs that match the associated NPP Rule.
TIF Selective Screening provides the following functions:
- Definition of feature-specific pre-NPP processing to be performed by TIF
- Service Action specification (including Service Action names and precedence)
- Service Action Handlers
- Feature-specific post-NPP processing, if needed
TIF Selective Screening Service Action Handlers
- Number Portability lookup
- Interpretation of results from Number Portability lookups
- NPP processing of Service Actions that are used for TIF Selective Screening
- Post-NPP processing of the outgoing message
Table 2-11 provides a summary of the Service Actions used for TIF Selective Screening.
Table 2-11 Summary of TIF Selective Screening Service Actions
| Service Action | Description | Function | Precedence |
|---|---|---|---|
| BLRLS | TIF CdPN Blocklist in UDR-based Release | Indicates that a Release (REL) message will be generated if the Called Party is found in the Number Portability and the CdPN contains the CdBL flag=YES | 91 |
| BLNFNDRLS | TIF CdPN not-in-UDR Release | Indicates that a Release (REL) message will be generated if a matching Called Party number is not found in the Number Portability | 91 |
| FPFXRLS | TIF Pfx CdPN Release (non-UDR based) | Indicates that a Release (REL) message will be generated if a matching Called Party rule is found by NPP | 92 |
| SELSCR | TIF CdPN UDR-based Selective Screening | Indicates that the message is selectively screened based on CdPN and CgPN Call Types | 91 |
BLRLS Service Action Handler for TIF Selective Screening (CdPN) UDR-based RELEASE
The BLRLS Service Action Handler indicates that a Release (REL) message will be sent if Called Party digits are found in the Number Portability with CdBL=YES.
Configuration Options Used
TIFOPTS options SAxVAL[1] and SAxVAL[2] contain the Release Cause value used in the Release (REL) message for an IAM ISUP ANSI message and an IAM ISUP ITU message.
Action Performed
The BLRLS Service Action Handler performs an Number Portability lookup and finds the CdPN digits in the Number Portability. If the Called Party digits in the Number Portability have CdBL=YES, the Service Action Handler indicates that a Release (REL) message will be sent to the originator of the IAM during post-NPP processing. The Release (REL) message will contain the provisioned SAxVAL[1] value for the Release Cause if ANSI ISUP, or the provisioned SAxVAL[2] value for the Release Cause if ITU ISUP. The REL will not include a Redirection Number. The original MSU is discarded.
If the TIF Selective Screening feature is not turned on, the CdPN is not found in the Number Portability, or the CdPN is found but is not marked as Blocklisted, the Service Action Handler completes without any changes.
No Formatting Actions are populated.
Terminating Action?
Yes, when the subscriber is marked as Blocklisted.
BLNFNDRLS Service Action Handler for TIF Selective Screening (CdPN) not-in-UDR RELEASE
The BLNFNDRLS Service Action Handler performs an Number Portability lookup and does not find the CdPN digits in the Number Portability.
Configuration Options Used
TIFOPTS options SAxVAL[1] and SAxVAL[2] contain the Release Cause value used in the Release (REL) message for an IAM ISUP ANSI message and an IAM ISUP ITU message.
Action Performed
If CdPN digits are not found in the Number Portability, the Service Action Handler indicates that a Release (REL) message will be sent to the originator of the IAM during post-NPP processing. The Release (REL) message will contain the provisioned SAxVAL[1] value for the Release Cause if ANSI ISUP, or the provisioned SAxVAL[2] value for the Release Cause if ITU ISUP. The REL will not include a Redirection Number. The original MSU is discarded.
If the TIF Selective Screening feature is not turned on, the CdPN is not found in the Number Portability, or the CdPN is found but is not marked as Blocklisted, the Service Action Handler completes without any changes.
No Formatting Actions are populated.
Terminating Action?
Yes.
FPFXRLS Service Action Handler for TIF Prefix CdPN non-UDR-based RELEASE
The FPFXRLS Service Action Handler indicates that a Release (REL) message will be sent to the originator of the IAM if a matching Called Party Rule is found by NPP.
The FPFXRLS Service Action is mutually exclusive with all other Service Actions in the same Action Set.
Configuration Options Used
TIFOPTS options SAxVAL[1] and SAxVAL[2] contain the Release Cause value used in the Release (REL) message for an IAM ISUP ANSI message and an IAM ISUP ITU message.
Action Performed
If the Called Party prefix is found by NPP, the Service Action Handler indicates that a Release (REL) message will be sent to the originator of the IAM during post-NPP processing. If the subscriber is marked as Blocklisted, the Release (REL) message will contain the provisioned SAxVAL[1] value for the Release Cause if ANSI ISUP, or with the provisioned SAxVAL[2] value for the Release Cause if ITU ISUP. The Release (REL) message will not include a Redirection Number. The original MSU is discarded.
If the TIF Range CdPN Blocklist feature is not turned ON , the Service Action Handler completes without any changes.
No Formatting Actions are populated.
Terminating Action?
Yes.
SELSCR Service Action Handler for TIF CdPN UDR-based Selective Screening
The SELSCR Service Action Handler Indicates that the message is selectively screened based on CdPN and CgPN Call Types.
Configuration Options Used
TIFOPTS options SAxVAL[1] and SAxVAL[2] contain the Release Cause value used in the Release (REL) message for an IAM ISUP ANSI message and an IAM ISUP ITU message. TIFOPTS options SAxDGTS indicate the Call Type for CdPNs that match the associated NPP Rule.
Action Performed
If the CdPN is screened by the TIF selective screening process, the TIF selective screening post-processing checks whether the SAxVAL values are provisioned with SELSCR Service Action in the TIF NPP Service. If the SAxVAL is provisioned for the incoming ISUP message type, then the ISUP RELease (REL) message is generated with the RELease cause provisioned in SAxVAL.
If the SAxVAL is not provisioned (None) for the incoming ISUP message type, then the ISUP message is relayed to the destination point code in the incoming message (original DPC). The CdPN and CgPN parameters in the ISUP message are formatted based on the respective FASCRCD and FASCRCG formatting list values provisioned in the NPP Action Set associated with TIF NPP Service.
Terminating Action?
No