Route, manage, and monitor every STT, TTS, and LLM request from a single API. The Gateway controls performance, cost, region, and compliance so your voice stack behaves predictably across providers and markets.

The challenge
Voice AI has no unified control.
Teams stitch together STT, TTS, and LLM providers, each with its own routing rules, latency behaviors, cost profiles, and regional limitations. There is no consistent way to decide how requests run or where inference takes place. Without unified control, performance shifts across providers, costs become unpredictable, and compliance is difficult to guarantee. Voice workloads remain fragmented, making global deployment hard to scale and even harder to trust.

Capabilities
The Gateway manages routing, performance, compliance, and provider selection from one API. It standardizes how STT, TTS, and LLM requests run across regions, workloads, and providers.

How it works
Route. Govern. Observe.
The Gateway standardizes how STT, TTS, and LLM requests run across providers. It applies routing rules, performance settings, and compliance constraints before executing any workload, so every request behaves predictably across regions.
Route
Define language, region, cost, or performance preferences. The Gateway chooses the closest or approved provider and sets where the request will run.
Govern
Apply performance profiles, residency requirements, quality thresholds, and provider constraints. The Gateway enforces these rules consistently for every request.
Observe
Access metrics, logs, and traces to understand where models ran, how they performed, and why specific providers were selected.
Trusted by product teams building voice AI worldwide.
Compliance by design

Region-locked execution
Requests run only in the geographies you approve, including EU-only, US-only, Germany, or other sovereign zones with strict residency.
Compliance-aware routing
The Gateway applies your organization’s rules for region, industry, and provider selection before executing any STT, TTS, or LLM workload.
Access control and secure traffic
Enforce allowlists or blocklists and secure all API and WebSocket traffic through isolated routing paths.
Auditable operations
Every request generates logs, traces, and provider decisions so teams can verify how and where inference was executed.
Faqs
Unmuted.
Resources
Pricing
Contact
©2026 SLNG