Custom Software for Telecom — Accurate Billing, Protected CPNI, Built to Scale

Subscriber call records, location data, and the routing logic that moves traffic are among the most sensitive and most regulated assets in tech. CPNI under Section 222, FCC rules from STIR/SHAKEN to truth-in-billing, CALEA lawful-intercept obligations, E911 and the NG911 transition — a contractor who has never read the CPNI rules will ship a portal that leaks call detail and a billing system that loses CDRs.

We build with those constraints from the first architecture diagram. CPNI is gated behind authentication and role-based access, with every disclosure logged. CDR pipelines are idempotent so a record is never double-counted into a billing dispute. PII and call detail are encrypted at rest with envelope keys and in transit with TLS 1.3, and the audit log is immutable by design so your CPNI certification and any FCC inquiry have something real to look at.

Most industries deal with one or two overlapping frameworks. Telecom sits at the intersection of several at once. A single customer portal that shows usage, lets a subscriber change a plan, and exposes call history can simultaneously touch CPNI disclosure rules, truth-in-billing expectations, accessibility obligations under Section 255, and data-breach notification duties. Move into voice and STIR/SHAKEN attestation, CALEA, and E911 record accuracy join the stack.

Scale compounds everything. CDRs, usage events, and network telemetry arrive continuously and in volume; a rating error or a dropped batch becomes a revenue-leakage problem or a billing dispute inside a single cycle. And the integration surface is brittle: switches and SBCs emitting ASN.1 or fixed-width dumps, OSS/BSS platforms, provisioning and activation systems, number-porting through the NPAC ecosystem, and carrier interconnects — each with its own dialect, its own batch windows, and its own failure mode at 2 a.m. We have built mediation pipelines and audit-grade billing layers and know where the time actually goes.

CPNI (Section 222). Call detail, location, and service-and-billing data are protected. We build authentication before disclosure, role-restricted views for carrier reps, opt-in/opt-out tracking for marketing use, breach-notification hooks, and an immutable CPNI access-and-disclosure log that supports your annual CPNI certification.

FCC rules and truth-in-billing. Billing has to be clear, accurate, and defensible. We build rating and invoicing with idempotent CDR processing, reconciliation between mediation and billing, and an audit trail that reconstructs how every charge was derived — so a dispute is answered with records, not guesses.

STIR/SHAKEN and robocall mitigation. We build the software around attestation — call-signing event capture, traceback response support, and the records behind your Robocall Mitigation Database filing. The cryptographic signing stays with your SHAKEN/STIR provider; we wire the operational data and audit trail.

CALEA and lawful intercept. Where CALEA obligations apply, we design so lawful-intercept capabilities and the records around them are handled with strict access control, separation of duties, and an audit trail — coordinating with your compliance and legal teams rather than improvising the boundary.

E911 and NG911. Location and routing accuracy is a life-safety obligation. We build E911 record updates and validation into provisioning and number management, and design with the NG911 transition to IP-based emergency services in mind.

SOC 2 and data-breach notification. Carrier and enterprise partners run diligence before interconnect, and the FCC's updated breach-notification rules raise the stakes on incident handling. We build with SOC 2 Common Criteria — encryption, RBAC, change management, audit logging, incident response — and produce evidence packs for Vanta, Drata, or Secureframe.

Next.js 16 on the App Router with React 19 and TypeScript end to end for portals and consoles. Postgres for the system of record — Neon, Supabase, or RDS depending on posture — with Prisma or Drizzle as the type-safe ORM. CPNI and PII columns get KMS-backed envelope encryption, and the access-and-disclosure audit log lives in a separate append-only store. Resend handles transactional email with a verified domain and DMARC alignment.

For CDR mediation and high-volume ingestion we lean Python or a streaming worker tier — parsers for ASN.1 and fixed-width formats, a queue (BullMQ on Redis or Kafka where throughput demands it), and idempotent, replay-safe processing so a record is rated exactly once. A TypeScript dashboard sits over the top for operations and finance review. Auth uses Auth0, Clerk, or a Lucia-style stack with MFA required on every CPNI-touching and admin surface. Observability runs through Sentry plus a log aggregator (Datadog or Better Stack) with PII-aware redaction in the logger. The web tier deploys to Vercel; the data plane and any CALEA-scoped components run in a hardened VPC with strict access control.

Three patterns repeat. First, CDR processing is built without idempotency. A retry or a re-run double-counts records, and the operator discovers the problem when subscribers dispute their bills. Rating must be exactly-once and replay-safe from day one; reconstructing it after a billing-dispute wave is painful and erodes customer trust.

Second, CPNI access is treated as a normal permission instead of a regulated boundary. A portal or internal tool exposes call detail to anyone with a login, and there is no record of who looked at what. The first FCC inquiry or breach reveals that the company cannot produce a CPNI access log. Gate CPNI behind authentication and log every disclosure from the start.

Third, integration scope is underestimated. A founder assumes the switch, the OSS/BSS, and the porting system all have clean APIs and the work is a sprint. The reality is flat-file exchanges, batch windows, and vendor onboarding measured in weeks. We pad those timelines and build reconciliation so systems do not silently drift apart.

The quiet existential risk in telecom is not a bug. It is subscriber call records and location data — CPNI you are legally obligated to protect — sitting on a foreign contractor's laptop, or a billing logic change that quietly starts leaking revenue. That is exactly why we are US-based, founder-led, and engagement-first on every project.

William Beltz writes or reviews every line of code that touches your subscribers, their call detail, or your billing logic. NDAs are mutual and signed before discovery. Source code lives in your GitHub organization, not ours. The handoff is documented for either ongoing collaboration or in-house ownership — your call.

Telecom carriers are a documented target for nation-state intrusion — call-detail and location data are intelligence gold, and recent campaigns against US carriers proved the point. We run MITRE ATT&CK-aligned assessments that simulate those groups' documented TTPs against your environment, then deliver an ATT&CK heatmap of which techniques succeed, which get detected, and which get blocked.

Standard penetration testing covers the rest — external perimeter, web application, and API surface — with reporting that supports carrier security questionnaires and cyber-insurance requirements. For operators running their own domain, our Active Directory pentest walks the full chain from a standard workstation to Domain Admin, with every step mapped to ATT&CK technique IDs your SOC or MSSP can alert on.

QUANT LAB USA does not yet have a published telecom case study, and we are saying that plainly rather than inventing one. What we have is the high-volume, audit-grade architecture pattern — idempotent data pipelines, immutable access logs, encryption, and ATT&CK-aligned pentesting — that other data-intensive domains already run on in production, including the broadcast and media-operations work behind Clear Channel Broadcast.

A discovery engagement for telecom starts with a data-flow and compliance review — your CDR feeds, your billing and OSS/BSS systems, your CPNI exposure, and the records that have to survive an FCC inquiry. You come out with a wireframed UI, a data model with idempotency and audit points marked, and a phased estimate — useful even if you take it to another developer.