Direct routes for A2P messaging.

Wholesale A2P messaging for carriers, aggregators and platforms, delivered over SMPP and a REST API.

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Delivery is the product.

Grey routes are cheap until carrier filtering blocks them, and your clients' campaigns with them. Callvox routes through direct carrier connections.

Direct carrier connections

Direct operator connections, without third-party hubs between your traffic and the destination carrier.

HLR / MNP pre-validation

Validate every number before send. Reduce failed deliveries and wasted spend on invalid or ported numbers.

DLR webhooks

Delivery receipts pushed to your endpoint, with delivery state visibility: delivered, failed, pending, expired.

POST /v1/sms/send HTTP/1.1
Content-Type: application/json

{
  "to": "+1234567890",
  "from": "YourBrand",
  "text": "Your OTP: 123456"
}

// DLR Webhook Response
{
  "message_id": "msg_abc123xyz",
  "status": "delivered",
  "timestamp": "2024-01-15T14:32:45Z"
}

Technical specifications

Protocols

REST API and SMPP

Sender IDs

Availability and registration confirmed per destination

Unicode

Full UCS-2 / UTF-16 support

Encoding

GSM-7 (160 chars), UCS-2 (70 chars)

DLR support

Delivered, undelivered, buffered, expired, rejected

Where does your traffic go?

Tell us your messaging corridors and we'll come back with route options.

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