# SLNG Documentation

## Docs

- [Embed a SLNG voice agent on your website](https://docs.slng.ai/agents/embed-web.md): Add a browser-based voice session with a SLNG voice agent to any web page using LiveKit, a React frontend, and a backend proxy that hides your API key.
- [LiveKit Agents plugin for SLNG](https://docs.slng.ai/agents/livekit-plugin.md): Use the livekit-plugins-slng Python package to connect LiveKit Agents to any STT or TTS model on the SLNG gateway with a single configuration switch.
- [Create agent](https://docs.slng.ai/api-reference/agents/create-agent.md): Create a new voice agent.
- [Delete agent](https://docs.slng.ai/api-reference/agents/delete-agent.md): Soft-delete a voice agent.
- [Duplicate agent](https://docs.slng.ai/api-reference/agents/duplicate-agent.md): Create a server-side copy of an existing voice agent.
- [Get agent](https://docs.slng.ai/api-reference/agents/get-agent.md): Get a single voice agent by ID.
- [List agents](https://docs.slng.ai/api-reference/agents/list-agents.md): List all voice agents for your organisation.
- [Replace agent](https://docs.slng.ai/api-reference/agents/replace-agent.md): Replace a voice agent (full update).
- [Update agent (partial)](https://docs.slng.ai/api-reference/agents/update-agent-partial.md): Partially update a voice agent.
- [Cognigy STT](https://docs.slng.ai/api-reference/bridges/cognigy-stt-bridge/cognigy-stt-bridge-http.md): Transcribe audio via Cognigy Voice Gateway protocol bridge.
- [Cognigy STT](https://docs.slng.ai/api-reference/bridges/cognigy-stt-bridge/cognigy-stt-bridge-ws.md): Stream live audio to SLNG over the Cognigy Voice Gateway WebSocket protocol and receive real-time STT transcripts from any supported model.
- [Cognigy TTS](https://docs.slng.ai/api-reference/bridges/cognigy-tts-bridge/cognigy-tts-bridge-http.md): Synthesize speech via Cognigy Voice Gateway protocol bridge.
- [Cognigy TTS](https://docs.slng.ai/api-reference/bridges/cognigy-tts-bridge/cognigy-tts-bridge-ws.md): Stream synthesized speech from SLNG over the Cognigy Voice Gateway WebSocket protocol using any supported text-to-speech model and voice.
- [Jambonz STT](https://docs.slng.ai/api-reference/bridges/jambonz-stt-bridge/jambonz-stt-bridge-http.md): Transcribe audio via Jambonz custom STT protocol bridge. The model_variant path parameter specifies the target STT model (e.g., deepgram/nova:3, slng/openai/whisper:large-v3).
- [Jambonz STT](https://docs.slng.ai/api-reference/bridges/jambonz-stt-bridge/jambonz-stt-bridge-ws.md): Reference for the Jambonz custom WebSocket STT bridge channel, including init, audio, stop messages and the model_variant routing parameter.
- [Jambonz TTS](https://docs.slng.ai/api-reference/bridges/jambonz-tts-bridge/jambonz-tts-bridge-http.md): Synthesize speech via Jambonz custom TTS protocol bridge. The model_variant path parameter specifies the target TTS model (e.g., deepgram/aura:2).
- [Jambonz TTS](https://docs.slng.ai/api-reference/bridges/jambonz-tts-bridge/jambonz-tts-bridge-ws.md): Reference for the Jambonz custom WebSocket TTS bridge channel, including stream, flush, stop messages, binary audio frames, and model_variant routing.
- [Dispatch call](https://docs.slng.ai/api-reference/calls/dispatch-call.md): Dispatch an outbound call for a voice agent.
- [Get call](https://docs.slng.ai/api-reference/calls/get-call.md): Get details of a specific call.
- [List calls](https://docs.slng.ai/api-reference/calls/list-calls.md): List calls for a voice agent (paginated).
- [Create web session](https://docs.slng.ai/api-reference/sessions/create-web-session.md): Create a browser session for a voice agent.
- [Create batch job](https://docs.slng.ai/api-reference/speechmatics/create-batch-job.md): Submit audio for asynchronous transcription. Supports file upload (`multipart/form-data`), URL input, and presigned S3 upload (`application/json`). For the presigned-upload flow, the first call (`mode: "presign"`) returns **200 OK** with an upload URL — the job is not created until step 3. All other…
- [Delete batch job](https://docs.slng.ai/api-reference/speechmatics/delete-batch-job.md): Delete a completed or failed job. Only jobs in a terminal status (`DONE` or `FAILED`) can be deleted.
- [Get batch job](https://docs.slng.ai/api-reference/speechmatics/get-batch-job.md): Returns the full details of a job (status, config, timestamps, error info). Poll until `status` reaches `DONE` or `FAILED`.
- [Get batch job files](https://docs.slng.ai/api-reference/speechmatics/get-batch-job-files.md): Returns signed download URLs for the input audio and the output transcripts of a completed job. Outputs are returned per available format (`json`, `txt`, `srt`); missing formats are omitted.
- [List batch jobs](https://docs.slng.ai/api-reference/speechmatics/list-batch-jobs.md): Returns a paginated list of jobs for your organization. Supports filtering by status, model, and submission date range, plus sorting.
- [Nova 2](https://docs.slng.ai/api-reference/stt/deepgram-nova-2/nova-2-http.md): Transcribe audio using Deepgram Nova 2 with VAD and speaker diarization.
- [Nova 2](https://docs.slng.ai/api-reference/stt/deepgram-nova-2/nova-2-ws.md): Stream real-time speech-to-text transcripts from Deepgram Nova 2 over WebSocket with voice activity detection, speaker diarization, and partial results.
- [Nova 3 Medical](https://docs.slng.ai/api-reference/stt/deepgram-nova-3-medical/nova-3-medical-http.md): Transcribe medical audio using Deepgram Nova 3 Medical with specialized vocabulary.
- [Nova 3 Medical](https://docs.slng.ai/api-reference/stt/deepgram-nova-3-medical/nova-3-medical-ws.md): Stream real-time medical transcription from Deepgram Nova 3 Medical over WebSocket with healthcare-specific vocabulary, VAD, and speaker diarization.
- [Nova 3 (English)](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-english-http.md): Transcribe English audio using SLNG-hosted Deepgram Nova 3.
- [Nova 3 (English)](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-english-ws.md): Stream real-time English transcripts from SLNG-hosted Deepgram Nova 3 over WebSocket with low-latency partials, finals, and speaker diarization.
- [Nova 3 (Hindi)](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-hindi-http.md): Transcribe Hindi audio using SLNG-hosted Deepgram Nova 3.
- [Nova 3 (Hindi)](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-hindi-ws.md): Stream real-time Hindi speech-to-text from SLNG-hosted Deepgram Nova 3 over WebSocket with low-latency partial and final transcripts and VAD.
- [Nova 3](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-http.md): Transcribe audio using Deepgram Nova 3 with VAD and speaker diarization.
- [Nova 3 (Kannada)](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-kannada-http.md): Transcribe Kannada audio using SLNG-hosted Deepgram Nova 3.
- [Nova 3 (Kannada)](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-kannada-ws.md): Stream real-time Kannada speech-to-text from SLNG-hosted Deepgram Nova 3 over WebSocket with low-latency partial and final transcripts and VAD.
- [Nova 3 (Marathi)](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-marathi-http.md): Transcribe Marathi audio using SLNG-hosted Deepgram Nova 3.
- [Nova 3 (Marathi)](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-marathi-ws.md): Stream real-time Marathi speech-to-text from SLNG-hosted Deepgram Nova 3 over WebSocket with low-latency partial and final transcripts and VAD.
- [Nova 3 (Multi-Language)](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-multi-language-http.md): Transcribe multi-language audio using SLNG-hosted Deepgram Nova 3.
- [Nova 3 (Multi-Language)](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-multi-language-ws.md): Stream real-time multilingual transcripts from SLNG-hosted Deepgram Nova 3 over WebSocket with automatic language detection across supported languages.
- [Nova 3 (Spanish)](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-spanish-http.md): Transcribe Spanish audio using SLNG-hosted Deepgram Nova 3.
- [Nova 3 (Spanish)](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-spanish-ws.md): Stream real-time Spanish speech-to-text from SLNG-hosted Deepgram Nova 3 over WebSocket with low-latency partial and final transcripts and VAD.
- [Nova 3 (Tamil)](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-tamil-http.md): Transcribe Tamil audio using SLNG-hosted Deepgram Nova 3.
- [Nova 3 (Tamil)](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-tamil-ws.md): Stream real-time Tamil speech-to-text from SLNG-hosted Deepgram Nova 3 over WebSocket with low-latency partial and final transcripts and VAD.
- [Nova 3 (Telugu)](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-telugu-http.md): Transcribe Telugu audio using SLNG-hosted Deepgram Nova 3.
- [Nova 3 (Telugu)](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-telugu-ws.md): Stream real-time Telugu speech-to-text from SLNG-hosted Deepgram Nova 3 over WebSocket with low-latency partial and final transcripts and VAD.
- [Nova 3](https://docs.slng.ai/api-reference/stt/deepgram-nova-3/nova-3-ws.md): Stream real-time speech-to-text transcripts from Deepgram Nova 3 over WebSocket with voice activity detection, speaker diarization, and partial results.
- [Reson8 STT v1](https://docs.slng.ai/api-reference/stt/reson8-stt-v1/reson8-stt-v1-ws.md): Real-time speech-to-text transcription using Reson8 via WebSocket. Supports streaming audio with word-level timestamps, confidence scores, and partial results.
- [Saaras v3](https://docs.slng.ai/api-reference/stt/sarvam-ai-saaras/saaras-v3-http.md): Transcribe audio using Sarvam AI Saaras with domain-aware speech recognition for 23 languages and flexible output modes.
- [Saaras v3](https://docs.slng.ai/api-reference/stt/sarvam-ai-saaras/saaras-v3-ws.md): "Stream real-time speech-to-text transcripts from Sarvam AI Saaras v3 over WebSocket with voice activity detection across 23 Indian languages. Session configuration is provided via query parameters on the WebSocket upgrade URL: `language-code`, `mode`, `sample_rate`, `input_audio_codec`, `high_vad_s…
- [Speech AI Real-time v4](https://docs.slng.ai/api-reference/stt/soniox-speech-ai-real-time-v4/speech-ai-real-time-v4-ws.md): Stream real-time transcripts from Soniox Speech AI v4 over WebSocket with speaker diarization, language detection, and configurable endpoint detection.
- [Cartesia Sonic 3](https://docs.slng.ai/api-reference/tts/cartesia-sonic-3/cartesia-sonic-3-ws.md): Stream low-latency speech synthesis from Cartesia Sonic 3 over WebSocket with a multilingual catalog of voices and context-aware controls.
- [Aura 2 (English)](https://docs.slng.ai/api-reference/tts/deepgram-aura-2/aura-2-english-http.md): Synthesize English speech using SLNG-hosted Deepgram Aura 2.
- [Aura 2 (English)](https://docs.slng.ai/api-reference/tts/deepgram-aura-2/aura-2-english-ws.md): Stream low-latency conversational English text-to-speech from SLNG-hosted Deepgram Aura 2 over WebSocket, optimized for production voice agents.
- [Aura 2](https://docs.slng.ai/api-reference/tts/deepgram-aura-2/aura-2-http.md): Synthesize speech using Deepgram Aura 2 for conversational voice agents.
- [Aura 2 (Spanish)](https://docs.slng.ai/api-reference/tts/deepgram-aura-2/aura-2-spanish-http.md): Synthesize Spanish speech using SLNG-hosted Deepgram Aura 2.
- [Aura 2 (Spanish)](https://docs.slng.ai/api-reference/tts/deepgram-aura-2/aura-2-spanish-ws.md): Stream low-latency conversational Spanish text-to-speech from SLNG-hosted Deepgram Aura 2 over WebSocket, optimized for production voice agents.
- [Aura 2](https://docs.slng.ai/api-reference/tts/deepgram-aura-2/aura-2-ws.md): Stream low-latency conversational text-to-speech from Deepgram Aura 2 over WebSocket as raw binary frames, optimized for ultra-low-latency voice agents.
- [Inworld Max 1.5](https://docs.slng.ai/api-reference/tts/inworld-max-1-5/inworld-max-1-5-http.md): Synthesize speech using SLNG-hosted Inworld Max 1.5.
- [Inworld Max 1.5](https://docs.slng.ai/api-reference/tts/inworld-max-1-5/inworld-max-1-5-ws.md): Stream multilingual speech synthesis from SLNG-hosted Inworld Max 1.5 over WebSocket using SLNG's unified low-latency TTS protocol.
- [Kugel 1 Turbo](https://docs.slng.ai/api-reference/tts/kugel-1-turbo/kugel-1-turbo-ws.md): Stream low-latency high-quality speech from KugelAudio Kugel 1 Turbo over WebSocket with expressiveness controls and SLNG's unified TTS protocol.
- [Kugel 1](https://docs.slng.ai/api-reference/tts/kugel-1/kugel-1-ws.md): Stream high-quality speech synthesis from KugelAudio Kugel 1 over WebSocket with expressiveness controls and SLNG's unified TTS protocol.
- [Kugel 2](https://docs.slng.ai/api-reference/tts/kugel-2/kugel-2-ws.md): Stream high-quality speech synthesis from KugelAudio Kugel 2 over WebSocket with expressiveness controls and SLNG's unified TTS protocol.
- [Murf Falcon](https://docs.slng.ai/api-reference/tts/murf-falcon/murf-falcon-ws.md): Stream high-quality multilingual speech synthesis from Murf Falcon over WebSocket with selectable encodings, sample rates, and SLNG's unified TTS protocol.
- [Create pronunciation dictionary](https://docs.slng.ai/api-reference/tts/pronunciation-dictionaries/create-pronunciation-dictionary-http.md): Create a reusable pronunciation dictionary for TTS rewrite rules.
- [Delete pronunciation dictionary](https://docs.slng.ai/api-reference/tts/pronunciation-dictionaries/delete-pronunciation-dictionary-http.md): Delete one pronunciation dictionary by name from the authenticated organization.
- [Get pronunciation dictionary](https://docs.slng.ai/api-reference/tts/pronunciation-dictionaries/get-pronunciation-dictionary-http.md): Read one pronunciation dictionary by name from the authenticated organization.
- [List pronunciation dictionaries](https://docs.slng.ai/api-reference/tts/pronunciation-dictionaries/list-pronunciation-dictionaries-http.md): List pronunciation dictionaries for the authenticated organization.
- [Arcana v3 (English)](https://docs.slng.ai/api-reference/tts/rime-arcana-v3/arcana-v3-english-http.md): Synthesize English speech using Rime Arcana v3 TTS model.
- [Arcana v3 (English)](https://docs.slng.ai/api-reference/tts/rime-arcana-v3/arcana-v3-english-ws.md): Text-to-Speech API for generating English speech using Rime Arcana v3 TTS model. Establishes a WebSocket connection for real-time text-to-speech.
- [Arcana v3 (Hindi)](https://docs.slng.ai/api-reference/tts/rime-arcana-v3/arcana-v3-hindi-http.md): Synthesize Hindi speech using Rime Arcana v3 TTS model.
- [Arcana v3 (Hindi)](https://docs.slng.ai/api-reference/tts/rime-arcana-v3/arcana-v3-hindi-ws.md): Text-to-Speech API for generating Hindi speech using Rime Arcana v3 TTS model. Establishes a WebSocket connection for real-time text-to-speech.
- [Arcana v3 (Spanish)](https://docs.slng.ai/api-reference/tts/rime-arcana-v3/arcana-v3-spanish-http.md): Synthesize Spanish speech using Rime Arcana v3 TTS model.
- [Arcana v3 (Spanish)](https://docs.slng.ai/api-reference/tts/rime-arcana-v3/arcana-v3-spanish-ws.md): Text-to-Speech API for generating Spanish speech using Rime Arcana v3 TTS model. Establishes a WebSocket connection for real-time text-to-speech.
- [Bulbul Stream v3](https://docs.slng.ai/api-reference/tts/sarvam-ai-bulbul-stream-v3/bulbul-stream-v3-http.md): HTTP-streaming multilingual TTS for Indian languages with 30+ speaker voices. Returns raw audio bytes (chunked) in the codec selected via `output_audio_codec`. Unlike `sarvam/bulbul:v3`, no `X-Duration` header is sent and no JSON envelope is used.
- [Bulbul v3](https://docs.slng.ai/api-reference/tts/sarvam-ai-bulbul-v3/bulbul-v3-http.md): Synthesize speech using Sarvam AI Bulbul with high-quality multilingual TTS for Indian languages and 30+ speaker voices.
- [Bulbul v3](https://docs.slng.ai/api-reference/tts/sarvam-ai-bulbul-v3/bulbul-v3-ws.md): Stream multilingual Indian-language speech from Sarvam AI Bulbul v3 over WebSocket with 30+ speaker voices and SLNG's unified low-latency TTS protocol.
- [Soniox TTS v1](https://docs.slng.ai/api-reference/tts/soniox-tts-v1/soniox-tts-v1-http.md): Real-time text-to-speech with streaming WebSocket and one-shot HTTP synthesis
- [Soniox TTS v1](https://docs.slng.ai/api-reference/tts/soniox-tts-v1/soniox-tts-v1-ws.md): Stream real-time speech synthesis from Soniox TTS v1 over WebSocket with low-latency incremental audio output and SLNG's unified TTS protocol.
- [Unified STT](https://docs.slng.ai/api-reference/unified-api/unmute-stt-bridge/unmute-stt-bridge-http.md): Transcribe audio via SLNG's native WebSocket protocol bridge. The model_variant path parameter specifies the target STT model (e.g., deepgram/nova:3, slng/openai/whisper:large-v3).
- [Unified STT](https://docs.slng.ai/api-reference/unified-api/unmute-stt-bridge/unmute-stt-bridge-ws.md): Stream audio to any SLNG-supported STT model over the unified WebSocket protocol with init, audio, finalize, partial, and final transcript messages.
- [Unified TTS](https://docs.slng.ai/api-reference/unified-api/unmute-tts-bridge/unmute-tts-bridge-http.md): Synthesize speech via SLNG's native WebSocket protocol bridge. The model_variant path parameter specifies the target TTS model (e.g., deepgram/aura:2).
- [Unified TTS](https://docs.slng.ai/api-reference/unified-api/unmute-tts-bridge/unmute-tts-bridge-ws.md): Stream synthesized audio from any SLNG-supported TTS model over the unified WebSocket protocol with init, text, flush, and binary audio frames.
- [How to use Batch API](https://docs.slng.ai/batch-guide.md): Submit audio for asynchronous transcription on the SLNG Batch API using direct file upload, URL input, or presigned S3 upload. Supported formats and limits.
- [SLNG changelog](https://docs.slng.ai/changelog.md): Release notes for the SLNG speech and language API. New TTS and STT models, voice agent features, breaking changes, and bug fixes.
- [Agent Infra](https://docs.slng.ai/dashboard/agent-infra.md): Use Agent Infra in the SLNG Dashboard to create voice agents from templates, configure prompts and models, test in-browser, and monitor live call traffic.
- [API Keys](https://docs.slng.ai/dashboard/api-keys.md): Create and delete API keys for the SLNG TTS, STT, Batch, and Voice Agents APIs from the Dashboard at app.slng.ai, and use them to authenticate.
- [Dashboard](https://docs.slng.ai/dashboard/index.md): Set up your SLNG workspace at app.slng.ai. Create API keys, configure inbound and outbound telephony, and manage voice agent infrastructure.
- [Telephony](https://docs.slng.ai/dashboard/telephony.md): Set up SIP trunks and phone-number connections in the SLNG Dashboard for outbound and inbound voice agent calls, including BYOC and managed providers.
- [SLNG Voice Agent API examples](https://docs.slng.ai/examples/agents-api.md): Code samples for the SLNG Voice Agent API in JavaScript and Python. Create, list, update, test, and delete voice agents through the agent lifecycle.
- [Dispatching outbound calls](https://docs.slng.ai/examples/agents-calls.md): Send outbound voice agent calls on SLNG with E.164 numbers, SIP trunks, template variables, and call status webhooks. JavaScript and Python code examples.
- [Configuring SLNG voice agents](https://docs.slng.ai/examples/agents-config.md): Configure SLNG voice agents. Write effective system prompts, wire up tools and webhooks, and use template variables to personalize calls at dispatch time.
- [Speech-to-text HTTP examples](https://docs.slng.ai/examples/stt-http.md): Transcribe audio files with the SLNG STT HTTP API. Code samples in curl, Python, and Node.js for basic transcription, word timestamps, and diarization.
- [Speech-to-text WebSocket examples](https://docs.slng.ai/examples/stt-websocket.md): Transcribe live audio with the SLNG STT WebSocket API. Python and Node.js samples covering streaming microphone input, interim results, and diarization.
- [Text-to-speech HTTP examples](https://docs.slng.ai/examples/tts-http.md): Generate speech audio with the SLNG TTS HTTP API. Code samples in curl, Python, and Node.js for basic requests, voice selection, and streaming responses.
- [Text-to-speech WebSocket examples](https://docs.slng.ai/examples/tts-websocket.md): Stream speech with the SLNG TTS WebSocket API. Python and Node.js code samples for sub-100ms latency, mid-sentence interrupt, and continuous text input.
- [Getting started with SLNG](https://docs.slng.ai/getting-started.md): Authenticate, send your first text-to-speech and speech-to-text requests, and stream over WebSocket with SLNG in about five minutes.
- [SLNG Documentation](https://docs.slng.ai/index.md): Build voice agents, transcription, and TTS apps with one API across providers like Deepgram, ElevenLabs, Cartesia, Sarvam, Soniox, and more.
- [Voice platform integrations](https://docs.slng.ai/integrations/overview.md): Use SLNG STT and TTS through LiveKit Agents, Cognigy Voice Gateway, and Jambonz with no protocol rewrites. Region overrides included.
- [Models by Language](https://docs.slng.ai/models/by-language.md): Browse SLNG TTS and STT models grouped by supported language — English, Spanish, French, German, Hindi, Japanese, Mandarin, and 30+ Indian languages.
- [Models by Region](https://docs.slng.ai/models/by-region.md): See which SLNG TTS and STT models are deployed in each AWS region across North America, Europe, and Asia-Pacific for low-latency routing.
- [Model Catalog](https://docs.slng.ai/models/index.md): Browse the full catalog of TTS and STT models on SLNG — search by provider, language, or AWS deployment region for production voice agents.
- [Speech-to-Text Models](https://docs.slng.ai/models/stt.md): Browse every STT model on SLNG — Deepgram Nova, Sarvam Saaras, Soniox Speech AI, and Reson8 transcription, grouped by provider.
- [Text-to-Speech Models](https://docs.slng.ai/models/tts.md): Browse every TTS model on SLNG — Cartesia, Deepgram Aura, ElevenLabs, KugelAudio, Murf, Rime Arcana, Sarvam, and Soniox voices.
- [Pronunciation dictionaries](https://docs.slng.ai/pronunciation-dictionaries.md): Create reusable pronunciation dictionaries and attach them to any SLNG TTS request so brand names, acronyms, and domain terms are spoken the way you expect.
- [HTTP vs. WebSocket protocols](https://docs.slng.ai/protocols.md): Compare HTTP and WebSocket protocols on SLNG. Latency, flow, complexity, and when to use each for text-to-speech and speech-to-text workloads.
- [Region and world-part overrides](https://docs.slng.ai/region-override.md): Pin SLNG requests to a specific region or world-part using the X-Region-Override and X-World-Part-Override HTTP headers for data residency control.
- [Command-line interface](https://docs.slng.ai/sdks/cli.md): Install the voiceai CLI and run text-to-speech, speech-to-text, and streaming examples from a terminal.
- [SDKs and tools](https://docs.slng.ai/sdks/index.md): Install the voiceai CLI, the JavaScript or Python SDK, or drop the slng agent skills into your coding agent.
- [JavaScript SDK](https://docs.slng.ai/sdks/javascript.md): Install voiceai-sdk on npm and call text-to-speech, speech-to-text, and streaming endpoints from Node, Bun, or Deno.
- [Python SDK](https://docs.slng.ai/sdks/python.md): Install voiceai-sdk on PyPI and call text-to-speech, speech-to-text, and streaming endpoints with sync or async clients.
- [Agent skills](https://docs.slng.ai/sdks/skills.md): Install the slng-ai/skills pack so coding agents like Claude Code can call text-to-speech, transcription, and voice-agent APIs on your behalf.
- [Bring your own key with caching](https://docs.slng.ai/tts-byok.md): Bring your own provider API key and benefits from the SLNG gateway's TTS cache.
- [Supported models](https://docs.slng.ai/unified-api/models-supported.md): Full list of TTS and STT models reachable through the SLNG Unified API. Deepgram Nova and Aura, Rime Arcana, ElevenLabs, Cartesia, Sarvam, and more.
- [SLNG Unified API](https://docs.slng.ai/unified-api/overview.md): The SLNG Unified API gives you one request format for every STT and TTS model. Swap Deepgram, Rime, ElevenLabs, Cartesia, and more by changing the URL.
- [Parameters coverage](https://docs.slng.ai/unified-api/parameters-coverage.md): Compatibility matrix for the SLNG Unified API. Which TTS and STT request parameters are supported by Deepgram, ElevenLabs, Cartesia, Sarvam, and Rime.
- [Voice agents on SLNG](https://docs.slng.ai/voice-agents.md): Build LLM-powered voice agents on SLNG with outbound and inbound calls, web sessions, tools, webhooks, template variables, and human transfer.
- [Cartesia Sonic 3](https://docs.slng.ai/voices/cartesia-sonic-3.md): Browse Cartesia Sonic 3 voices on SLNG with audio samples — low-latency multilingual TTS across 40+ languages including English, Spanish, French, and Hindi.
- [Deepgram Aura](https://docs.slng.ai/voices/deepgram-aura.md): Browse Deepgram Aura 2 voices on SLNG with audio samples — natural conversational TTS across English, Spanish, Dutch, French, German, Italian, and Japanese.
- [Kugel](https://docs.slng.ai/voices/kugel.md): Browse KugelAudio Kugel voices on SLNG with audio samples — expressive multilingual TTS across 25+ languages including English, Hindi, and Chinese.
- [Murf Falcon](https://docs.slng.ai/voices/murf.md): Browse Murf Falcon voices on SLNG — real-time multilingual TTS over WebSocket with English, Spanish, French, German, Italian, Hindi, and Chinese.
- [Rime Arcana voices](https://docs.slng.ai/voices/rime-arcana.md): Browse Rime Arcana v2 and v3 voices on SLNG with audio samples and characteristics — supports English, Spanish, French, German, Arabic, and Hindi.
- [Sarvam Bulbul v3](https://docs.slng.ai/voices/sarvam-bulbul.md): Browse Sarvam Bulbul v3 voices on SLNG — multilingual TTS for 11 Indian languages including Hindi, Tamil, Telugu, Marathi, and Indian English.
- [Soniox TTS v1](https://docs.slng.ai/voices/soniox.md): Browse Soniox TTS v1 voices on SLNG with audio samples — real-time low-latency text-to-speech with 60+ supported languages and streaming WebSocket synthesis.
- [WebSocket integration guide](https://docs.slng.ai/websocket-guide.md): Production patterns for SLNG WebSocket integrations. Reconnection, backpressure, audio buffering, error handling, and troubleshooting common issues.
- [WebSocket API reference](https://docs.slng.ai/websockets.md): Stream text-to-speech and speech-to-text in real time over WebSocket. Message format, init handshake, sub-100ms streaming, and reconnection patterns.

## OpenAPI Specs

- [tts-slng.oas](https://docs.slng.ai/api-reference/openapi/tts-slng.oas.yaml)
- [stt-slng.oas](https://docs.slng.ai/api-reference/openapi/stt-slng.oas.yaml)
- [bridges-unmute.oas](https://docs.slng.ai/api-reference/openapi/bridges-unmute.oas.yaml)
- [bridges-jambonz.oas](https://docs.slng.ai/api-reference/openapi/bridges-jambonz.oas.yaml)
- [bridges-cognigy.oas](https://docs.slng.ai/api-reference/openapi/bridges-cognigy.oas.yaml)
- [agents.oas](https://docs.slng.ai/api-reference/agents/agents.oas.yaml)
- [tts-sarvam.oas](https://docs.slng.ai/api-reference/openapi/tts-sarvam.oas.yaml)
- [tts-soniox.oas](https://docs.slng.ai/api-reference/openapi/tts-soniox.oas.yaml)
- [tts-pronunciation-dictionaries.oas](https://docs.slng.ai/api-reference/openapi/tts-pronunciation-dictionaries.oas.yaml)
- [batch.oas](https://docs.slng.ai/api-reference/batch/batch.oas.json)
- [tts-elevenlabs.oas](https://docs.slng.ai/api-reference/openapi/tts-elevenlabs.oas.yaml)
- [stt-deepgram.oas](https://docs.slng.ai/api-reference/openapi/stt-deepgram.oas.yaml)
- [tts-deepgram.oas](https://docs.slng.ai/api-reference/openapi/tts-deepgram.oas.yaml)
- [stt-sarvam.oas](https://docs.slng.ai/api-reference/openapi/stt-sarvam.oas.yaml)
- [gateway.oas](https://docs.slng.ai/api-reference/gateway.oas.yaml)

## AsyncAPI Specs

- [tts-slng.asyncapi](https://docs.slng.ai/api-reference/asyncapi/tts-slng.asyncapi.yaml)
- [stt-slng.asyncapi](https://docs.slng.ai/api-reference/asyncapi/stt-slng.asyncapi.yaml)
- [tts-cartesia.asyncapi](https://docs.slng.ai/api-reference/asyncapi/tts-cartesia.asyncapi.yaml)
- [bridges-unmute.asyncapi](https://docs.slng.ai/api-reference/asyncapi/bridges-unmute.asyncapi.yaml)
- [bridges-jambonz.asyncapi](https://docs.slng.ai/api-reference/asyncapi/bridges-jambonz.asyncapi.yaml)
- [bridges-cognigy.asyncapi](https://docs.slng.ai/api-reference/asyncapi/bridges-cognigy.asyncapi.yaml)
- [stt-sarvam.asyncapi](https://docs.slng.ai/api-reference/asyncapi/stt-sarvam.asyncapi.yaml)
- [tts-deepgram.asyncapi](https://docs.slng.ai/api-reference/asyncapi/tts-deepgram.asyncapi.yaml)
- [tts-soniox.asyncapi](https://docs.slng.ai/api-reference/asyncapi/tts-soniox.asyncapi.yaml)
- [tts-elevenlabs.asyncapi](https://docs.slng.ai/api-reference/asyncapi/tts-elevenlabs.asyncapi.yaml)
- [stt-deepgram.asyncapi](https://docs.slng.ai/api-reference/asyncapi/stt-deepgram.asyncapi.yaml)
- [tts-sarvam.asyncapi](https://docs.slng.ai/api-reference/asyncapi/tts-sarvam.asyncapi.yaml)
- [tts-murf.asyncapi](https://docs.slng.ai/api-reference/asyncapi/tts-murf.asyncapi.yaml)
- [tts-kugelaudio.asyncapi](https://docs.slng.ai/api-reference/asyncapi/tts-kugelaudio.asyncapi.yaml)
- [stt-soniox.asyncapi](https://docs.slng.ai/api-reference/asyncapi/stt-soniox.asyncapi.yaml)
- [stt-reson8.asyncapi](https://docs.slng.ai/api-reference/asyncapi/stt-reson8.asyncapi.yaml)
- [slng.asyncapi](https://docs.slng.ai/api-reference/asyncapi/slng.asyncapi.yaml)
- [elevenlabs.asyncapi](https://docs.slng.ai/api-reference/asyncapi/elevenlabs.asyncapi.yaml)
- [deepgram.asyncapi](https://docs.slng.ai/api-reference/asyncapi/deepgram.asyncapi.yaml)
- [cognigy.asyncapi](https://docs.slng.ai/api-reference/asyncapi/cognigy.asyncapi.yaml)