> ## Documentation Index > Fetch the complete documentation index at: https://docs.orbit.devotel.io/llms.txt > Use this file to discover all available pages before exploring further. # Send an SMS > Send an SMS message to an E.164 phone number. ## OpenAPI ````yaml /openapi.yaml post /api/v1/messages/sms openapi: 3.1.0 info: title: Devotel CPaaS API description: Orbit by Devotel — Communications Platform as a Service API version: 1.0.0 contact: name: Devotel url: https://devotel.io email: support@devotel.io license: name: Proprietary servers: - url: https://api.orbit.devotel.io description: Production security: - Bearer: [] - ApiKey: [] tags: - name: Messages description: >- Send and manage messages across all channels (SMS, WhatsApp, RCS, Email, Viber, etc.) - name: Fax description: >- List and track fax (MMS/T.38) transmissions on Telnyx-backed fax numbers (sending flows through the Messaging API) - name: Agents description: AI agent creation, configuration, and execution - name: Voice description: Voice calls, IVR, conferencing, and SIP trunking - name: OnCall description: On-call rotations and escalation policy planning for incident alerting - name: Webhooks description: Webhook endpoint management and delivery logs - name: Numbers description: Phone number search, provisioning, and configuration - name: Brand Identity description: >- Unified cross-channel brand trust posture (10DLC, toll-free, WhatsApp, RCS, branded calling, number KYC) - name: Contacts description: Contact management, segmentation, and lifecycle tracking - name: Campaigns description: Marketing campaign orchestration and analytics - name: Flows description: Automation flow builder and execution engine - name: Templates description: Message template management and approval workflows - name: Settings description: Organization, channel, and user preference settings - name: Verify description: OTP generation and verification across channels - name: Push description: Push notification delivery via FCM and APNs - name: Integrations description: Third-party service connections and OAuth management - name: CDP description: >- Customer Data Platform — activation surface (CRM object sync, streaming destinations, ad-audience activation) - name: Files description: >- Server-to-server media upload, listing, retrieval, and deletion (signed-URL backed) - name: Commerce description: >- Omnichannel conversational-commerce — persistent cart + checkout state machine, channel-agnostic hosted pay-by-link, native WhatsApp checkout, and AP2-style agent payment mandates. - name: Sync description: >- Real-time shared-state primitive (Twilio Sync parity) — Documents, Maps, Lists, and ephemeral Streams, with change events relayed over the /api/v1/ws/sync WebSocket gateway paths: /api/v1/messages/sms: post: tags: - Messages summary: Send an SMS description: Send an SMS message to an E.164 phone number. requestBody: required: true content: application/json: schema: type: object required: - to - body properties: to: type: string minLength: 1 maxLength: 64 description: >- Phone number. Accepts E.164 (preferred) or display formats and PBX-extension suffixes (`x1234`, `;ext=1234`, `,ext=1234`); normalized server-side to E.164 before send. body: type: string minLength: 1 maxLength: 1600 description: SMS body text webhook_url: type: string format: uri description: DLR callback URL metadata: type: object additionalProperties: true description: Custom key-value metadata test: type: boolean description: >- When true, marks this send as a throwaway test. The provider call still happens and billing still runs, but the recipient is NOT auto-upserted into the contacts table. Use this for dashboard 'Send Test SMS' flows to avoid polluting the operator's contacts list with verification numbers. TEST-USER P1 / DECISION — TEST_SMS_NO_CONTACT_CREATE_2026_05_28. validity_period: type: string pattern: ^[1-9][0-9]*[smhd]?$ description: >- Twilio ValidityPeriod parity. Carrier-level expiry hint after which the SMSC drops the attempt. Suffixed grammar: s (seconds, default), m (minutes), h (hours), d (days). Examples: '30m', '1h', '24h', '2d'. Consumed by Telnyx (valid_until), Jasmin (validity-period), and SMPP (validity_period hours). GAP2_CPaaS_33. max_price: type: number minimum: 0 exclusiveMinimum: 0 maximum: 100 description: >- Twilio MaxPrice parity. Hard per-message USD ceiling. The send is rejected 422 MAX_PRICE_EXCEEDED if the resolved per-unit cost exceeds this cap — useful as an anti-fraud guard on international SMS to premium-rate destinations. Capped at 100 USD per message to defend against units mistakes. GAP2_CPaaS_33. fallback_from: type: string minLength: 1 maxLength: 64 description: >- Twilio FallbackFrom parity. An optional secondary sender identity recorded on the message as `metadata.fallback_from` for audit and record-keeping. Same allowed shape as `from` (E.164 / alphanumeric sender ID / `__shared_generic__`). Audit-only: the value is stored on the message record and is not currently auto-swapped in on a rejected attempt, so treat it as a record of intent rather than an active carrier-failover retry. responses: '202': description: SMS accepted for delivery content: application/json: schema: type: object description: SMS accepted for delivery properties: data: type: object additionalProperties: true properties: id: type: string status: type: string channel: type: string enum: - sms from: type: - 'null' - string to: type: - 'null' - string body: type: - 'null' - string segments: type: - 'null' - integer price: type: - 'null' - string - number currency: type: - 'null' - string external_id: type: - 'null' - string created_at: type: - 'null' - string format: date-time meta: type: object properties: request_id: type: string description: >- Unique request identifier (also returned in X-Request-Id header) timestamp: type: string format: date-time description: ISO 8601 UTC timestamp of the response '422': description: Default Response content: application/json: schema: type: object properties: error: type: object required: - code - message - status properties: code: type: string description: >- Machine-readable error code (e.g. INVALID_PHONE_NUMBER) message: type: string description: Human-readable error description status: type: integer description: HTTP status code details: type: object additionalProperties: true description: Additional context about the error meta: type: object properties: request_id: type: string timestamp: type: string format: date-time docs_url: type: string format: uri description: Link to relevant error documentation components: securitySchemes: Bearer: type: http scheme: bearer bearerFormat: JWT description: Dashboard JWT token from Clerk ApiKey: type: apiKey name: X-API-Key in: header description: Server-to-server API key (dv_live_sk_*) ````