Case Study: 48H Compliance
How a Tier-1 Operator validated GSMA FS.31 (Signaling Security) using TelcoSec Automation.
The 48H Compliance Sprint
T+0H
Baseline Detection
System scan identifying unauthorized Diameter peers from roamer interconnects.
✓ 14 Anomalies Logged
T+12H
Category 1/2 Hardening
Automated deployment of IP/GT spoofing filters across STPs and DEAs.
✓ Spoofing Surface Eliminated
T+36H
Stateful Firewalling
Enabling Cross-Protocol correlation (SS7 vs GTP) to prevent location tracking.
✓ Cat-3 Compliance Verified
T+48H
Audit Seal issued
Final evidence persistence to NIS2 Regulatory Safe Room.
✓ FS.31 Document Certified
REF // GSMA_FS.31_CONTROLS
Technical Control Deck
A deep-dive into the categorization of signaling filters required for FS.31 certification.
CAT_1
Direct Trust
Filters based on direct interconnect agreements (White-listing GTs).
SEC_LOG:
FILTER: GT(GLOBAL_TITLE) IN RANGE(MNO_X)CAT_2
Anti-Spoofing
Validating that incoming messages originate from the correct network range.
SEC_LOG:
VERIFY: ORIGIN_GT == SOURCE_IPCAT_3
Stateful Guard
Validating message sequence (e.g., Cat-3 SRI_FOR_SM only after Roam_Check).
SEC_LOG:
INSPECT: STATEFUL_SEQUENCE(SRI_SM, PRN_ACK)METRICS // POSTURE_IMPACT
Before vs. After Audit
34/100
BASELINE_SCAN
→
100/100
FS.31_CERTIFIED
MAP_FILTER_ACCURACY
98%
DIAMETER_EDGEROUTER_UPTIME
100%
LOCATION_SECURITY_SCORE
95%