SMS gateway
What is SMS gateway?
An SMS gateway is the system — hardware or, more commonly today, a cloud service — that translates messages between a sending application's API calls and the telecom protocols (like SMPP) carriers actually speak, handling routing, retries, and delivery receipts in between. A messaging platform's SMS gateway is what turns a single API call into the right carrier-specific message and routes the resulting delivery receipt back to the sender in near real time.
More detail
A gateway typically maintains multiple carrier and aggregator connections at once, choosing a route per message based on destination, cost, and delivery performance rather than a single fixed path.
Modern SMS gateways expose a REST API to integrators while handling the underlying SMPP binds, carrier-specific formatting, and retry logic behind the scenes.
Frequently asked
- Is an SMS gateway the same thing as a messaging API?
- They're closely related but not identical — the API is the interface an application uses to send a message, while the gateway is the underlying system that routes that message to the right carrier and returns delivery status.
- What happens if one carrier route fails?
- A well-built gateway typically retries over an alternate route or carrier connection automatically rather than failing the send outright, choosing among the routes available for that destination.
See also
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