Numbers Online SBC / SIP API

openapi: 3.2.0
info:
  title: Numbers Online Phone Intelligence SBC / SIP API
  description: Phone number parsing, validation, and inbound caller-intelligence as a supplementary signal.
  version: 1.0.0
  contact:
    name: Phone Numbers Online
    url: https://numbers.online
servers:
- url: https://numbers.online
  description: Production server
- url: http://localhost:3000
  description: Development server
tags:
- name: SBC / SIP
  description: SIP redirect-server decisions for session border controllers (Kamailio, OpenSIPS, dSIPRouter, Sansay, Oracle/Acme Packet, ProSBC) via the operator-run shim recipe, plus an FCC robocall-mitigation evidence bundle — a supplementary call-setup signal, fail-open
paths:
  /api/v1/sbc/redirect:
    post:
      tags:
      - SBC / SIP
      summary: SBC / SIP redirect decision
      description: 'Call-setup decision for a SIP redirect server / SBC (Kamailio, OpenSIPS, dSIPRouter, Sansay, Oracle/Acme Packet, ProSBC), consumed by the operator-run shim recipe under /integrations. Given the calling number, returns a ClearIP-compatible decision the shim maps to a SIP final response: decision=block → 603 Decline; decision=redirect → 302 (the operator supplies the Contact); decision=allow|flag → the operator allow code (503 default, or 404 route-advance). `sip.code` is the exact recommended code. Requires a key with the `sbc_redirect` use case (every lookup-entitled key has it, backfilled). Billed per decision on the standard tier ($0.010); free tier is rate-limited. A 603 BLOCK is only ever a deterministic/authoritative fact (invalid number, or DNC listed / reassigned from a configured partner) — the low-confidence spam signal can only raise a flag/redirect. FAIL-OPEN on the call path: a timeout or error returns decision=allow rather than an error. AUTH fails closed (incl. opt-in operator HMAC signing via X-Operator-* headers; see GET /api/v1/account/signing). Every value is a supplementary signal — the SBC keeps every routing decision.'
      operationId: sbcRedirect
      security:
      - ApiKeyAuth: []
      - BearerAuth: []
      - CidQueryKeyAuth: []
      parameters:
      - name: Idempotency-Key
        in: header
        required: false
        description: Optional client-supplied request id for at-most-once billing on retries.
        schema:
          type: string
      - name: X-SBC-Budget-Ms
        in: header
        required: false
        description: The shim’s own call-setup deadline (ms). We never bill a decision that overran it. Capped at 5000.
        schema:
          type: integer
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - number
              properties:
                number:
                  type: string
                  description: The calling number (E.164 recommended).
                  example: '+14155552671'
                called_number:
                  type: string
                  description: The dialed/destination number (optional, reserved).
                  example: '+14155550100'
                verstat:
                  type: string
                  description: STIR/SHAKEN verstat passthrough; same accepted forms as /api/v1/lookup.
                  example: TN-Validation-Passed
                allow_code:
                  type: integer
                  enum:
                  - 503
                  - 404
                  default: 503
                  description: 'SIP code for allow/route-advance: 503 (ClearIP default) or 404 (Oracle/Acme, Ribbon, Metaswitch).'
                spam_threshold:
                  type: integer
                  minimum: 1
                  maximum: 99
                  default: 80
                  description: spam_score at/above which the decision becomes `flag` (advisory).
                redirect_threshold:
                  type: integer
                  minimum: 1
                  maximum: 99
                  description: 'Opt-in: spam_score at/above which the decision becomes `redirect` (302 auto-divert). Omit to disable.'
                block_reassigned:
                  type: boolean
                  default: false
                  description: Treat reassigned `yes` (from a configured partner) as a block.
                block_invalid:
                  type: boolean
                  default: true
                  description: Block an unparseable/invalid calling number (deterministic).
                budget_ms:
                  type: integer
                  description: Alternative to the X-SBC-Budget-Ms header.
      responses:
        '200':
          description: Supplementary redirect decision (uniform shape for known/unknown/valid/invalid numbers).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SbcRedirectResponse'
        '400':
          description: Missing/empty number or malformed JSON.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: Authentication required (or a required request signature was missing/invalid).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '429':
          $ref: '#/components/responses/RateLimited'
  /api/v1/compliance/evidence:
    get:
      tags:
      - SBC / SIP
      summary: FCC robocall-mitigation evidence bundle
      description: A signed, PII-free, independently-verifiable RECORD of the supplementary number-status checks this account performed over a window — aggregated from signed lookup receipts. An operator can attach it to / reference it in their OWN robocall-mitigation program documentation (47 CFR 64.6305, "analytics systems used" / "reasonable steps"). It is NOT an FCC certification, NOT a compliance determination, and does NOT make anyone "compliant" — the operator signs their own attestation. Numbers appear only as hashes. Account-level keys only; auth fails closed. Verify each receipt’s signature, the bundle signature, and the Merkle root against GET /api/v1/publickey.
      operationId: complianceEvidence
      security:
      - ApiKeyAuth: []
      - BearerAuth: []
      parameters:
      - name: from
        in: query
        required: false
        description: 'Window start (ISO 8601). Default: 365 days ago.'
        schema:
          type: string
          format: date-time
      - name: to
        in: query
        required: false
        description: 'Window end (ISO 8601). Default: now. Window capped at 400 days.'
        schema:
          type: string
          format: date-time
      responses:
        '200':
          description: The signed evidence bundle.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EvidenceBundle'
        '400':
          description: Invalid window.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: Authentication required.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          description: Tenant sub-keys cannot export evidence; use an account-level key.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
  /api/v1/account/signing:
    get:
      tags:
      - SBC / SIP
      summary: Operator HMAC signing secret (for the calling key)
      description: 'Operator-grade HMAC request signing (Phase 4.3) for the calling key. Returns the key’s HKDF-derived signing secret (exposed only to the holder of the key — equivalent exposure to the key itself), the canonical scheme, and whether signing is currently required. The secret is never stored; it is re-derived on demand. signing_secret is null when the deployment has no signing master configured. Also reachable at the resource-homed alias /api/v1/account/keys/self/signing. Deliberately NOT gated on the manage use case: a narrowed, signing-locked key must always reach its own signing config.'
      operationId: getSigning
      security:
      - ApiKeyAuth: []
      - BearerAuth: []
      responses:
        '200':
          description: Signing state + secret for the calling key.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SigningInfo'
        '400':
          description: Not available for dev-fallback keys.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: Authentication required.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
    post:
      tags:
      - SBC / SIP
      summary: Enable/disable HMAC signing on the calling key
      description: Toggle require_signed_requests on the calling key. When enabled, signed surfaces (e.g. /api/v1/sbc/redirect) require a valid X-Operator-Signature on this key. This management route is never itself signature-gated, so a key can always disable signing or re-fetch its secret.
      operationId: setSigning
      security:
      - ApiKeyAuth: []
      - BearerAuth: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - enabled
              properties:
                enabled:
                  type: boolean
      responses:
        '200':
          description: Updated signing state + secret.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SigningInfo'
        '400':
          description: Missing `enabled`, or a dev-fallback key.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: Authentication required.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    Receipt:
      type: object
      description: A signed lookup receipt (plan 3.3). No raw phone number is stored — only number_hash = sha256(E.164). Verify response_signature over the exact signed_payload bytes with the Ed25519 public key (GET /api/v1/publickey), then recompute sha256(your E.164) and match number_hash to bind the receipt to a number. Because a phone number is a small keyspace, number_hash is recomputable from a candidate number — treat the receipt id as bound to a specific number, not as anonymized, and share it only with parties entitled to know that number. A supplementary signal, not a compliance assertion.
      properties:
        receipt_id:
          type: string
          example: nol_rec_8sd91kfh20aJ
        schema_version:
          type:
          - string
          - 'null'
          example: '2026-06-03'
        number_hash:
          type: string
          description: SHA-256 hex of the E.164 — the only number representation stored.
        line_type:
          type:
          - string
          - 'null'
          example: mobile
        dnc_status:
          type:
          - string
          - 'null'
          enum:
          - not_listed
          - listed
          - unknown
          description: Supplementary do-not-call signal; "unknown" until a data partner is configured.
        reassigned_status:
          type:
          - string
          - 'null'
          enum:
          - 'no'
          - 'yes'
          - unknown
        context:
          type:
          - string
          - 'null'
          example: mcp:dnc_check
        checked_at:
          type:
          - string
          - 'null'
          format: date-time
          description: The "as of T" the receipt cryptographically binds.
        created_at:
          type: string
          format: date-time
        signed_payload:
          type:
          - string
          - 'null'
          description: The exact canonical JSON that was signed (commits to number_hash).
        response_signature:
          type:
          - string
          - 'null'
          description: '''ed25519:<base64>'', or ''unsigned''.'
        verification:
          type: object
          properties:
            algorithm:
              type: string
              example: ed25519
            public_key_url:
              type: string
              example: https://numbers.online/api/v1/publickey
            instructions:
              type: string
    SigningInfo:
      type: object
      description: Operator HMAC request-signing state + secret for the calling key (Phase 4.3).
      properties:
        signing_required:
          type: boolean
        scheme:
          type: string
          example: hmac-sha256
        max_skew_seconds:
          type: integer
          example: 300
        canonical:
          type: string
          example: METHOD\nPATH\nsha256(body)hex\nX-Operator-Timestamp\nX-Operator-Nonce
        headers:
          type: array
          items:
            type: string
        docs_url:
          type: string
        signing_secret:
          type:
          - string
          - 'null'
          description: The HKDF-derived HMAC secret for this key; null when signing is not configured on the deployment.
    EvidenceBundle:
      type: object
      description: A signed FCC robocall-mitigation evidence bundle (plan 4.5). PII-free (numbers only as hashes). A record of supplementary checks — NOT an FCC certification or compliance determination.
      properties:
        schema_version:
          type: string
          example: '2026-06-06'
        bundle_id:
          type: string
          example: nol_bundle_…
        operator:
          type: object
          properties:
            account_id:
              type:
              - string
              - 'null'
            key_prefix:
              type:
              - string
              - 'null'
        window:
          type: object
          properties:
            from:
              type: string
              format: date-time
            to:
              type: string
              format: date-time
        generated_at:
          type: string
          format: date-time
        totals:
          type: object
          description: 'Aggregate counts: checks, distinct_numbers, by_dnc, by_reassigned, by_context.'
        merkle_root:
          type:
          - string
          - 'null'
          description: SHA-256 Merkle root over the receipt leaves; null when the window held no receipts.
        receipts:
          type: array
          items:
            $ref: '#/components/schemas/Receipt'
        disclaimer:
          type: string
        response_signature:
          type: string
          description: '''ed25519:<base64>'' over the canonical bundle, or ''unsigned''.'
        truncated:
          type: boolean
          description: True when the window held more than the per-bundle receipt cap (disclosed, never silent).
        public_key_url:
          type: string
          example: https://numbers.online/api/v1/publickey
        verify:
          type: string
    SbcRedirectResponse:
      type: object
      description: Supplementary SBC/SIP redirect decision (plan 4.2). Same shape for known/unknown/valid/invalid numbers (anti-enumeration). Every field is a low-confidence supplementary signal — the SBC keeps the routing decision; Numbers Online never asserts a call is lawful, unlawful, safe, or spam.
      properties:
        schema_version:
          type: string
          example: '2026-06-06'
        e164:
          type:
          - string
          - 'null'
          example: '+14155552671'
        valid:
          type: boolean
        decision:
          type: string
          enum:
          - allow
          - flag
          - redirect
          - block
          description: Recommended action (supplementary). flag = advisory elevated risk (still an allow code).
        reason:
          type: string
          example: no_actionable_signal
          description: Machine-readable reason code for the decision (e.g. invalid_number, dnc_listed, risk_over_flag_threshold, latency_budget, error).
        sip:
          type: object
          description: The SIP final response the operator’s shim should emit.
          properties:
            code:
              type: integer
              enum:
              - 603
              - 302
              - 503
              - 404
              example: 503
              description: 603 block · 302 redirect · 503/404 allow-route-advance.
            reason:
              type: string
              example: Service Unavailable
        redirect_target:
          type:
          - string
          - 'null'
          description: Always null — the operator supplies the 302 Contact (screening/diversion target) in their own shim config.
        advisory:
          type: object
          properties:
            spam_score:
              type:
              - integer
              - 'null'
              minimum: 1
              maximum: 99
              description: Low-confidence supplementary spam signal; null when unavailable. Never drives a block. FROZEN field name — `risk` is the disclosed read.
            risk:
              $ref: '#/components/schemas/RiskView'
            confidence:
              type: string
              enum:
              - low
            line_type:
              type:
              - string
              - 'null'
              example: mobile
            verstat:
              type: string
              example: unknown
            dnc_status:
              type: string
              enum:
              - not_listed
              - listed
              - unknown
            reassigned_status:
              type: string
              enum:
              - 'no'
              - 'yes'
              - unknown
        signal:
          type: string
          enum:
          - supplementary
        provider:
          type: string
          example: numbers.online
        receipt_id:
          type:
          - string
          - 'null'
          example: nol_rec_8sd91kfh20aJ
        insufficient_balance:
          type: boolean
          description: When true, the call is still ALLOWED on deterministic fields only (no fresh CNAM dip). Top up to restore full signal.
        as_of:
          type: string
          format: date-time
    Error:
      type: object
      properties:
        success:
          type: boolean
          example: false
          description: Legacy field emitted ONLY by the pre-v1 parse family (/api/parse, /api/parse/bulk, /api/countries). /v1 routes return only `error` — do not depend on `success` there.
        error:
          type: string
          description: Human-readable error message (prose — switch on `code`, not on this string).
        code:
          type: string
          enum:
          - missing_key
          - invalid_key
          - use_case_forbidden
          - rate_limited_key
          - rate_limited_pool
          - rate_limited_ip
          - signature_invalid
          - insufficient_balance
          - account_suspended
          - paid_verification_required
          - receipt_invalid
          description: 'Stable machine-readable error code (added 2026-06-12, additive — older errors may omit it). See the "Error codes" section in the API description for the full table. A valid key on the wrong use case returns 403 use_case_forbidden (not 401): re-authing will not fix a permissions problem.'
        retry_after_seconds:
          type: integer
          description: 'Present on 429s: seconds until the window resets (mirrors the Retry-After header).'
      required:
      - error
    RiskView:
      type: object
      description: 'One risk vocabulary (added 2026-06-11, additive — no schema_version bumps): the same numeric signal as the surface''s legacy field, plus a band and the MODEL label that says which pipeline scored it. The legacy fields (`spam_score`, `risk_score`/`risk_level`) are frozen forever; this object is the disclosed, consistent read. A null score yields the uniform unknown shape ({score:null, level:"unknown", model:null}) on every branch (anti-enumeration; fail-open nulls are load-bearing). The numeric scales are deliberately NOT unified across models — `model` is what tells them apart. See "Risk models" in the spec intro.'
      properties:
        score:
          type:
          - integer
          - 'null'
          description: The risk score on the MODEL's own scale (1–99 for first_party_plus_restricted_sources; 0–100 for the others); null when no signal.
        level:
          type: string
          enum:
          - low
          - medium
          - high
          - unknown
          description: 'Shared banding: <40 low, <70 medium, ≥70 high; unknown when score is null. NOTE: the SBC default flag threshold is a separate policy knob (80) — level high does not automatically flag.'
        model:
          type:
          - string
          - 'null'
          enum:
          - first_party_plus_restricted_sources
          - first_party_plus_external
          - dial_structural
          - null
          description: Which scoring pipeline produced the score; null when score is null.
  responses:
    RateLimited:
      description: Per-key rate limit exceeded. Retry after the number of seconds in the Retry-After header.
      headers:
        Retry-After:
          description: Seconds to wait before retrying.
          schema:
            type: integer
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key
      description: API key for authentication
    BearerAuth:
      type: http
      scheme: bearer
      description: Bearer token authentication
    CidQueryKeyAuth:
      type: apiKey
      in: query
      name: key
      description: API key in the `?key=` query param. Accepted by the header-less PBX endpoint GET /api/v1/cid/{number} and by the webhook adapters POST /api/v1/integrations/retell/inbound, POST /api/v1/integrations/vapi/tool, and POST /api/v1/sbc/redirect, whose upstream platforms set only a static webhook URL and cannot send an Authorization/X-API-Key header. The key can leak into access logs — use a dedicated, rotated key, and prefer header auth wherever the client supports it.