# SMSC firewall with AI content filtering. - Canonical URL: https://www.broadnet.me/operators/sms-firewall - Language: en - Last updated: 2026-10-20 - Publisher: BroadNet (https://www.broadnet.me) - Markdown version of the page above, generated from the rendered page. SMSC Firewall · Application-layer · For MNOs An application-layer SMS firewall that sits in front of your SMSC and inspects every inbound message in real time — content filtering, sender authentication, rate limiting, intelligent routing, and ML-driven anti-fraud. Block spam, phishing, and unauthorized traffic before it reaches your core, with revenue assurance built in. [Book SMS Firewall assessment](https://www.broadnet.me/contact?topic=firewall-assessment&product=sms-firewall) [Estimate A2P leakage recovery](https://www.broadnet.me/contact?topic=leakage-recovery&product=sms-firewall) We also send A2P traffic. It passes your firewall under the same rules as every other sender, and your team owns the verdicts. How the firewall treats our traffic MNO-grade security GSMA Associate Member Revenue assurance built-in ![BroadNet SMS Firewall shield — fraudulent SMS blocked on the left, legitimate traffic delivered on the right](https://www.broadnet.me/marketing/products/firewall/fw-shield-1352.webp) BroadNet · SMS firewall Firewall intelligence e& Egypt operator deployment +23% A2P revenue, year one 60+ firewall deployments Neutrality and governance ## We also send A2P traffic. Here is how your firewall treats it. BroadNet sells enterprise messaging and the firewalls that filter it, so an operator's first question is a fair one: what does the firewall do to BroadNet's own traffic? The answer is built into how every deployment runs. > “The fact that the same vendor sells our enterprise customers their CPaaS is why the numbers actually match the reports.” Head of Wholesale & Messaging, MENA tier-1 mobile operator (anonymised) [Review the governance model with a carrier engineer](https://www.broadnet.me/operators/contact) ### Same rules for every sender BroadNet's own enterprise traffic reaches your subscribers through the same firewall and the same rules as every other aggregator and sender. There is no vendor exemption. ### You own the ruleset and the verdicts Your fraud and revenue-assurance teams own the rules. Every change is version-controlled and needs a second approver (maker-checker), and false-positive whitelists are operator-controlled. Every verdict is your network's decision, and the data stays yours. ### Audits and disputes run on records Every decision is logged with the rule that fired and exports as CSV, JSON or PDF for partner disputes and regulator inquiries. A dispute about BroadNet traffic is settled against the same records as any other. ### Aligned with GSMA FS.11 Rule categories follow GSMA FS.11 and FS.19, so your team and your regulator review the firewall against a published industry framework, not a vendor's private taxonomy. How it sits in the network ## From interconnect ingress to clean delivery, in 5 hops. The firewall lives transparently between your interconnect partners and your SMSC. Every inbound A2P and P2P message is inspected, scored, and decided before it touches the core — at signaling speed, with message ordering preserved. 1. 01 · Ingress Inbound SMPP / SS7 MO and A2P traffic enters the SMSC and STP via SMPP binds and SS7 links from interconnect partners. 0 added hop 2. 02 · Firewall DPI + ML Inline inspection of TPDU, sender ID, content, UDH, signaling origin. Per-message risk score 0–1.0 in sub-ms. p99 < 1.4ms 3. 03 · Policy Verdict engine Rules match score, route, partner, brand. Verdict: pass · quarantine · block · log. p50 < 0.6ms 4. 04 · Core Operator SMSC Clean traffic forwarded to the operator's existing SMSC. No re-order, no duplication. in-order preserved 5. 05 · Handset Subscriber Subscriber receives only legitimate, billed messages. Quarantined traffic offered back at A2P intl rate. legitimate only 6. ← CDR · regulator log · RA dispute feed 01 · Ingress Inbound SMPP / SS7 MO and A2P traffic enters the SMSC and STP via SMPP binds and SS7 links from interconnect partners. 0 added hop 02 · Firewall DPI + ML Inline inspection of TPDU, sender ID, content, UDH, signaling origin. Per-message risk score 0–1.0 in sub-ms. p99 < 1.4ms 03 · Policy Verdict engine Rules match score, route, partner, brand. Verdict: pass · quarantine · block · log. p50 < 0.6ms 04 · Core Operator SMSC Clean traffic forwarded to the operator's existing SMSC. No re-order, no duplication. in-order preserved 05 · Handset Subscriber Subscriber receives only legitimate, billed messages. Quarantined traffic offered back at A2P intl rate. legitimate only Capabilities ## One firewall. Six places fraud hides. AI content filtering, sender authentication, rate limiting, intelligent routing, and ML anti-fraud — every control an operator needs, running inline at the SMSC in real time. ### Deep packet inspection Inspect every MAP, SMPP, and HTTP submission at the SMSC and signaling edge. Decode TPDU, sender ID, content, encoding, UDH headers — without breaking message order. SMPP MAP/SS7 HTTP ### ML-based fraud scoring Per-message risk scoring trained on labelled traffic from real Tier-1 carriers. Detects emerging spam fingerprints, phishing kits, and bypass patterns hours after they appear. 0.0–1.0 score Self-retraining Operator allowlist ### SIM box detection Behavioural fingerprinting across velocity, IMSI churn, recipient diversity, signaling origin, and content homogeneity. Identify SIM farms before they burn your termination rates. Velocity IMSI churn Geo-fence ### Sender ID spoofing detection Cryptographic and registry-based validation of every alphanumeric sender. Catch brand impersonation of banks, government, and mobile operators before the SMS hits the subscriber. Registry-backed Bank-grade Real-time ### Grey route blocking Route validation against commercial agreements. SS7 origins, SMPP accounts, and source IPs cross-checked against the operator's monetised partner list. Bypass traffic is dropped or quarantined for monetisation. Per-route policy Quarantine Auto-bill ### Sender ID registry integration Native integration with national and operator-private sender ID registries. Enforce registered originators per jurisdiction, automate brand onboarding, and produce regulator-ready audit logs. National registries Per-brand Audit log Threat coverage ## Every A2P threat, the control, the outcome. | Attack vector | Firewall control | Outcome | |---|---|---| | Grey-route & SIM-farm A2P bypass | Route validation against commercial agreements, plus SIM-box fingerprinting on velocity, IMSI churn and content homogeneity. | Bypass traffic dropped or quarantined for monetisation — at line rate. | | Sender-ID spoofing & brand impersonation | Registry-backed validation of every alphanumeric originator against the operator and national sender-ID registry. | Impersonation of banks, government and mobile operators blocked before it reaches the subscriber. | | Smishing & phishing content | Deep packet inspection of TPDU, content, encoding and URLs, scored by the self-retraining ML fraud engine. | Malicious content and links quarantined per policy while clean A2P flows untouched. | | Unregistered / off-jurisdiction senders | National and operator-private sender-ID registry enforcement per jurisdiction. | Only registered originators pass; the rest are held for onboarding with a regulator-ready log. | | SS7-injected & off-net submissions | SS7 MAP origin allowlist cross-checked against the monetised partner list. | Off-agreement SS7 origins flagged and dropped before they touch the core. | | Spam floods & throughput bursts | Per-route velocity buckets and per-message risk scoring. | Floods throttled early; legitimate traffic and message ordering preserved. | 3-pillar rule engine ## Technical. Business. Dynamic. One verdict. The application layer needs protocol enforcement, commercial policy, and behaviour-aware adaptation in the same engine. All three pillars run as one decision path — sub-10 ms added latency per message. Pillar 01 ### Technical rules Protocol-level enforcement. MAP operation allow/deny (granular MAP_MT_FORWARD_SM vs MAP_SEND_ROUTING_INFO control), OPC/DPC point-code filtering, Global Title controls, MCC/MNC conditions per partner. Every malformed signalling unit drops at decode. MAP control GT filter OPC/DPC MCC/MNC Pillar 02 ### Business rules Commercial policy expressed as data. Route selection per partner agreement, product-class rules (OTP, transactional, promotional), monetisation of bypass traffic toward agreed A2P channels. The firewall enforces the contract, not just the spec. Per-partner Per-product Route policy Monetise Pillar 03 ### Dynamic controls Behaviour-aware enforcement. TPS thresholds, burst detection, time-of-day windows, velocity per origin GT or SMPP account. The dynamic layer catches what static rules cannot — emerging campaigns, fresh SIM-box farms, sudden roaming anomalies. TPS thresholds Burst Time window Velocity Anti-Traffic Generation · ATG ## ML and heuristic tuning that never stops. Anti Traffic Generation is the continuous-learning layer that keeps the firewall ahead of grey-route operators. Models retrain on the operator's own ground-truth data, blended with anonymised signals from the wider BroadNet inspection plane. Heuristics are kept human-readable so the fraud team can audit, pin, or veto any signature. Continuous retraining Per-operator ground truth Auditable heuristics Maker-checker promotion SIM-box behavioural signatures ### Velocity & burst fingerprint Sustained sub-second velocity from a small MSISDN pool, characteristic of SIM-bank rotation patterns. Threshold and burst shape learned per route. ### Recipient-diversity entropy High Shannon entropy across destination MSISDNs paired with low entropy across content — the canonical SIM-box footprint. ### Sender-pattern homogeneity Repeating content with rotating originators, alphanumeric senders that never registered, originator formats inconsistent with the apparent geography. ### Signalling-origin anomaly Mismatch between claimed origin GT, MCC/MNC, and the SCCP path the message actually took into the network. Content & identity controls ## Approved senders. Approved templates. Trusted links. Three controls that together close the gap between “the message is technically valid” and “the message should be allowed to reach a subscriber.” ### Sender ID + template whitelisting Registered enterprises submit approved sender IDs and message templates. Inbound traffic is matched against the whitelist — approved senders with approved templates pass with minimal friction; unknown senders face stricter scoring. Language- and Unicode-aware, including complex scripts. - Per-brand templates - Bulk import / export - Language-aware ### URL & domain reputation Every URL is extracted, normalised and scored against a live reputation feed for known phishing kits, malware distributors, and freshly registered look-alike domains. Suspicious links drop the entire message at the wire, before the subscriber sees it. - Real-time feed - Look-alike detection - Per-route policy ### SMPP account control Per-account authentication, throughput envelopes, allowed-content classes, allowed sender-ID prefixes, and allowed destination ranges — enforced at bind time and re-enforced per submit. SMPP accounts are first-class policy objects, not just credentials. - Per-bind throughput - Allowed content - Allowed senders Production scale ## Built for carrier volumes, not lab benchmarks. The capacity envelope the platform actually runs at today — across the operators that route their A2P, P2P and roaming SMS through BroadNet's inspection plane. 10K+ TPS sustained Inspection capacity per cluster, across SMPP and SS7. 60+ Operator networks Operator networks running BroadNet’s firewall across MENA, Africa and Asia. 1,000+ Direct operator links Carrier reach feeding the global threat-intelligence baseline. Recovered-revenue dashboard ## Security and monetisation, on one screen. Every blocked, quarantined or rebilled message is attributed back to a route, partner, sender, or signature. The recovered-revenue view sits next to the protection view — so the finance, RA and security teams read the same source of truth, broken down by route and signature class. Per-route attribution Per-signature breakdown Finance · RA · Security CSV · API export Why a single platform ## One platform for security and monetisation. Splitting fraud protection from A2P monetisation across two different stacks is how revenue gets lost twice — once to the grey route, and again to the integration tax. BroadNet runs detection, policy enforcement and revenue recovery on the same engine, with the same audit trail and the same operator dashboard. 1 Inspection plane 1 Policy DSL 1 Audit & finance log Time-to-live ### Live in around fifteen business days. From kickoff to a production-grade enforcement plane — including passive-mirror baseline, rule-pack tuning against the operator's own traffic, and the maker-checker workflow that promotes the first inline rule. The same path every Tier-1 deployment has taken. Mirror baseline Rule tuning Inline cutover Operator handover How operators deploy ## From mirror to monetised in four steps. No big-bang cutovers. Each phase is gated on operator approval and measurable evidence — the way carrier networks actually adopt new inline gear. STEP 01 ### Probe Deploy in passive mirror mode at the SMSC and SS7 edge. Inspect 100% of inbound A2P and P2P traffic with zero risk to delivery. First fraud baseline ready in 7 days. STEP 02 ### Score Per-message ML scoring goes live. Sender ID, route, content, behaviour, and historical reputation collapse into a single risk value. Operators tune thresholds per route. STEP 03 ### Block Switch enforcement on per route, per partner, per sender ID. Grey routes, SIM boxes, and spoofed brands drop at the wire. Subscriber experience improves immediately. STEP 04 ### Monetize Quarantined bypass traffic is offered to originators at the commercial A2P rate. International A2P revenue, previously lost to grey routes, lands back on the operator P&L. Policy & integration ## Rules your fraud team can actually read. Declarative YAML rulesets, a per-message scoring API, and an SS7 MAP allowlist your STP engineers will recognise — version-controlled, maker-checker promoted, audited by default. fw.operator.local · prod Example ``` 1# /etc/broadnet/firewall/rules.d/grey-route.yaml2# Drop SMPP traffic from non-commercial partners3rule: block_unauthorized_smpp4 match:5 bind_system_id: !in [partners.commercial.list]6 source_ip: !in [partners.allowlist.cidrs]7 action: quarantine8 bill_at: a2p_international_rate9 10rule: smpp_simbox_velocity11 match:12 msisdn_velocity: "> 12/min"13 recipient_unique: "> 80% in 5m"14 content_homology: "> 0.92"15 action: block16 notify: fraud-ops@operator.tld17 18rule: spoofed_bank_senders19 match:20 sender_id: !registered_in [tdra.sender_registry]21 content: matches /OTP|verification|password/i22 action: drop23 audit: regulator_report.csv ``` Compliance & certification ## Carrier-grade, audited, regulator-ready. GSMA Associate Member ### GSMA Associate Member — security-aligned A GSMA Associate Member. Firewall controls are aligned to GSMA's messaging and signalling security guidelines (the FS-series). MEF Code of Conduct ### Mobile Ecosystem Forum Aligned with MEF's SMS Sender ID Code of Conduct and Trust in Enterprise Communications guidance. ISO 27001 · SOC 2 ### Information security baseline Operated on ISO 27001-certified infrastructure with SOC 2 Type II controls, GDPR data residency, and full audit trail. GSMA ISO 27001 ISO 9001 ISO 22301 SOC 2 GDPR MEF Operator due diligence ## Eight answers for the RFI shortlist. Yes. The verdict engine separates P2P from A2P using a combination of source bind, signaling origin, sender-ID format, and behavioural fingerprint. P2P false-positive rates from our Tier-1 deployments run below 0.002% of inspected MO — well inside the regulator tolerance envelopes in TDRA, CRA, and NTRA jurisdictions. We expose the per-bucket FP rate in the operator dashboard so RA teams can audit it weekly. All three. We almost always start in mirror mode on a passive tap at the SMSC and SS7 edge for 7–21 days, which gives the fraud and RA teams a clean baseline without risk to delivery. Once enforcement thresholds are agreed, the same nodes flip to inline at carrier-grade availability. Hybrid is common for multi-vendor SMSC estates: inline on the modern tier-1 front-ends, mirror behind legacy SMSC boxes. We sit transparently in front of the SMSC over standard SMPP 3.4 / 5.0 and behind the STP for SS7. We've integrated against every major tier-1 SMSC vendor and several in-house stacks. No SMSC config change is required — the firewall presents itself as another SMPP partner upstream and preserves message ordering, DLR pass-through, and CDR semantics. The fraud model retrains nightly on the labelled traffic from the operator's own ground truth (RA disputes, complaint queues, regulator advisories) blended with anonymised signals from BroadNet's global feed. Critical signatures (a freshly observed phishing kit, a new SIM-box velocity pattern) are pushed as hot rules within minutes by our fraud ops team in Dubai. Operators can pin or veto any model version from the dashboard. Yes. As a GSMA Associate Member we align with the applicable GSMA security guidance, and the firewall ships with the IR.71, IR.81, and IR.82 test packs so your security team can run regression after every rule change. Category 1/2/3 categorisation is applied per-link and per-bind, and the policy engine enforces the GSMA-recommended treatment per category — including the cat-3 silent drops with audit trail required by several MENA regulators. Per inspected message, banded by monthly volume, with no per-bind or per-link fee. There is a one-time NRE for the integration and a small annual maintenance fee that covers signature updates, the fraud ops team, and quarterly architecture reviews. Most Tier-1 deployments pay back inside the first quarter of enforcement from recovered A2P revenue alone. Every verdict is written to a tamper-evident log retained for the operator's regulatory window (typically 12–84 months). The reporting module ships with templates for TDRA (UAE), CST (KSA), CRA (Qatar), TRA (Oman), TRA (Bahrain), NTRA (Egypt), TRC (Jordan), ARPT (Algeria), ANRT (Morocco), and INT-T (Tunisia). Quarterly returns export as CSV, XML, or signed PDF. Yes. Thresholds are hierarchical — operator default → route → partner → brand → sender-ID. The dashboard exposes the effective threshold for any given verdict and lets your RA team A/B a new threshold against the last 30 days of traffic before promoting it to production. Promotions are gated on a maker-checker workflow with full audit trail. Need the architecture brief or a working session with our carrier engineers? [Book SMS Firewall assessment](https://www.broadnet.me/contact?topic=firewall-assessment&product=sms-firewall) ![Real-time operator network protection](https://www.broadnet.me/marketing/generated/viz-firewall.png) Operator-grade ## Protect and monetize at the signaling layer. In-network SMS and SS7 firewalls stop grey routes and fraud at line rate while legitimate traffic flows untouched. 200+ countries 99.99% Uptime 1,000+ MNO links [Talk to our carrier team](https://www.broadnet.me/operators/contact) Direct to carrier engineering ## Book your SMS Firewall assessment. A 30-minute working session with the engineers who deploy this gear at Tier-1 operators. Bring your route map and last quarter's A2P P&L — we will tell you where the leak is. [Book SMS Firewall assessment](https://www.broadnet.me/contact?topic=firewall-assessment&product=sms-firewall) [Estimate A2P leakage recovery](https://www.broadnet.me/contact?topic=leakage-recovery&product=sms-firewall) $ ssh carrier-eng@broadnet.me Try it Watch the firewall decide on sample traffic. Smishing, SMS pumping, sender spoofing and a grey-route bypass: verdict, reason, latency and action, seen from the operator and the enterprise side. [Open the fraud workbench](https://www.broadnet.me/tools/fraud-workbench) [Read the e& Egypt firewall case study](https://www.broadnet.me/customers/case-studies/e-egypt) Resources SMS Firewall datasheet [Download datasheet· PDF, 100 kB](https://www.broadnet.me/resources/datasheets/broadnet-sms-firewall-datasheet.pdf) [Product datasheets](https://www.broadnet.me/resources) Related guides & answers Go deeper on the concepts behind this product. [What is an SMS firewall Read](https://www.broadnet.me/answers/what-is-sms-firewall) [How does telecom fraud prevention work Read](https://www.broadnet.me/answers/telecom-fraud-prevention) [What is a grey route in SMS Read](https://www.broadnet.me/answers/what-is-grey-route-sms) [What is SMS pumping / artificial inflated traffic (AIT) Read](https://www.broadnet.me/answers/what-is-sms-pumping)