## Documentation Index

Fetch the complete documentation index at: [/llms.txt](https://docs.cognigy.com/llms.txt)

Use this file to discover all available pages before exploring further.

The table shows the cloud-based and on-premises TTS (Text-to-Speech) and STT (Speech-to-Text) providers supported by Cognigy Voice Gateway.

| Provider          | Cloud-Based | On-Premises |
|-------------------|-------------|-------------|
| TTS               | STT         | TTS         | STT         |
|-------------------|-------------|-------------|-------------|
| AWS               | +           | +           | -           | -           |
| Deepgram          | +           | +           | +           | +           |
| Deepgram Flux     | -           | +           | -           | -           |
| ElevenLabs        | +           | +           | -           | -           |
| Google            | +           | +           | -           | -           |
| Microsoft         | +           | +           | +           | +           |
| Nuance            | +           | +           | +           | +           |
| Speechmatics[1](https://docs.cognigy.com/voice-gateway/references/tts-and-stt-vendors#footnote1) | +           | +           | -           | -           |
| Custom            | +           | +           | +           | +           |

### More Information

- [Speech Services](https://docs.cognigy.com/voice-gateway/webapp/speech-services)

1 Access to the Speechmatics speech provider in Voice Gateway is behind a feature flag and requires additional configuration. For more information, refer to [Speech Services: Speechmatics](https://docs.cognigy.com/voice-gateway/webapp/speech-services#speechmatics).

Last modified on June 26, 2026.