2.6 TIF Blocklist Features
The TIF Subscriber CgPN Blocklist, TIF Range CgPN Blocklist, and TIF Selective Screening features provide TIF Blocklist capabilities, which help Network Operators reduce significantly or completely prevent spoofing their networks with illegal messages.
The TIF CgPN Blocklist functionality is controlled by the TIF
Subscriber CgPN Blocklist feature. The TIF Subscriber CgPN Blocklist (TIF
Subscr CgPN Blocklist) feature generates an ISUP Release (REL) message back to the
originator of a processed ISUP IAM, based on the Calling Party Number (CgPN), if either of the following scenarios occur:
- The CgPN that is found in the Number Portability is Blocklisted; the CgPN has CgBL flag=YES.
- The CgPN is not found in the Number Portability.
The TIF Range CgPN Blocklist feature generates an ISUP Release (REL) message back
to the originator of a processed ISUP IAM, based on the CgPN, if either of the following scenarios occur:
- The CgPN begins with a specific prefix.
- The Calling Party parameter is not present in the IAM or it is present with no digits in it.
The TIF CdPN Blocklist functionality is controlled by the TIF Selective Screening
feature. The TIF Selective Screening feature generates an ISUP Release (REL) message
back to the originator of a processed ISUP IAM, based on the Called Party Number (CdPN),
if any of the following scenarios occur:
- 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.