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

# Platform reference

> Find reference documentation for the nodes, endpoints, handover providers, NLU connectors, LLMs, developer tools, and voice settings that you use in Cognigy.

NiCE Cognigy documentationPlatform reference

Look up the resources, developer tools, and voice settings that you use to build on Cognigy, including supported options and available providers.

## Resource reference

> [card] [Node reference](https://docs.cognigy.com/ai/agents/develop/node-reference/overview)
>
> Configure flows with nodes in the Basic, Logic, Voice, Analytics, Service, AI, and other node categories.

> [card] [Endpoint reference](https://docs.cognigy.com/ai/agents/deploy/endpoint-reference/overview)
>
> Explore pre-built Cognigy endpoints including Webchat, Voice Gateway, REST, and third-party integrations.

> [card] [Handover provider reference](https://docs.cognigy.com/ai/escalate/handover-reference/overview)
>
> Connect agents to contact centers using Cognigy handover providers.

> [card] [NLU connector reference](https://docs.cognigy.com/ai/platform-features/nlu/external/nlu-connector-reference/all-nlu-connectors)
>
> Compare the NLU connectors available in Cognigy, including native and third-party connectors, and learn how to create a custom NLU connector.

> [card] [LLM providers](https://docs.cognigy.com/ai/agents/develop/gen-ai-and-llms/providers/all-providers)
>
> Explore the LLM providers that Cognigy supports and how to connect to them.

## Developer reference

> [card] [CLI](https://docs.cognigy.com/ai/for-developers/developers/cli.md)
>
> Manage Cognigy projects from the command line: clone and restore resources, create snapshots, and deploy agents.

> [card] [Client libraries](https://docs.cognigy.com/ai/for-developers/developers/client-libraries.md)
>
> Connect to Cognigy with clients in several languages, including the REST API Client. The clients are hosted on the Cognigy GitHub account.

> [card] [Extension framework](https://docs.cognigy.com/ai/for-developers/developers/extension-framework.md)
>
> Build custom extensions with TypeScript, including extension nodes for integrations and knowledge connectors for external knowledge databases.

## Voice reference

> [card] [Voice verbs](https://docs.cognigy.com/voice-gateway/references/verbs/overview)
>
> Build voice agents with verbs such as dial, hangup, listen, gather, and speech configuration, with code node examples.

> [card] [Voice events](https://docs.cognigy.com/voice-gateway/references/events/overview)
>
> Capture Voice Gateway events about the call lifecycle, for example, transfer and DTMF input, for analysis in Cognigy Insights.

> [card] [SIP response codes](https://docs.cognigy.com/voice-gateway/references/sip-response-codes.md)
>
> Look up SIP response codes from 200 to 603, with meanings and troubleshooting steps.

> [card] [TTS and STT vendors](https://docs.cognigy.com/voice-gateway/references/tts-and-stt-vendors.md)
>
> Explore the cloud-based and on-premises TTS and STT vendors that Cognigy Voice Gateway supports, with their languages and voices.

> [card] [SIP trunk providers](https://docs.cognigy.com/voice-gateway/references/sip-trunk-providers.md)
>
> Explore SIP trunk providers that are compatible with Cognigy Voice Gateway.