> ## Documentation Index
> Fetch the complete documentation index at: https://docs.slng.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

SLNG is offering an all-in-one voice AI infrastructure. It centralizes where you manage all your speech-to-text, LLM, and text-to-speech workloads across providers and regions, without rebuilding your stack for each one.

There are 3 main products that conform SLNG as of today:

## Execution Layer

Optimisation layer that sits between the models and your orchestrator, cutting latency and cost across the STT → LLM → TTS pipeline.

Applied on top of your Gateway calls:

* **Listen (STT)** — higher transcription quality
* **Think (LLM)** — skips redundant calls to save tokens and latency
* **Speak (TTS)** — caching for lower latency and cost

See [Execution Layer](/concepts/execution-layer/overview) to know more about it.

## Agent builder

Deploy and run voice agents with tool calling, behavior configuration, variable management, and full API control over live calls.

See [Agent Builder](/concepts/agents/overview) to know more about it.

## Model Gateway

One API for STT and TTS models from multiple providers. Route requests through SLNG for unified usage visibility, or run provider models self-hosted in your region.

See [Model Catalog](/models/catalog/all-models) for supported providers and models.

## Regions

Workloads run in 14 regions worldwide. Every product is available in every region.

See [Regions](/guides/regions/regions-map) for the full list and endpoints.