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

# Voice Gateway Nodes

Voice Gateway Nodes help you build a voice AI Agent using [Voice Gateway configuration](https://docs-classic.cognigy.com/voice-gateway/overview.md).

> [card] [Call Recording](https://docs-classic.cognigy.com/ai/agents/develop/node-reference/voice/voice-gateway/call-recording.md)
>
> The Call Recording Node starts or stops a conversation recording.

> [card] [DTMF](https://docs-classic.cognigy.com/ai/agents/develop/node-reference/voice/voice-gateway/dtmf.md)
>
> The DTMF Node plays DTMF digits to the caller.

> [card] [Hang Up](https://docs-classic.cognigy.com/ai/agents/develop/node-reference/voice/voice-gateway/hangup.md)
>
> The Hang Up Node instructs Voice Gateway to end the call.

> [card] [Mute Speech Input](https://docs-classic.cognigy.com/ai/agents/develop/node-reference/voice/voice-gateway/mute-speech-input.md)
>
> The Mute Speech Input Node controls when speech and DTMF user inputs are collected in your Flow.

> [card] [Play](https://docs-classic.cognigy.com/ai/agents/develop/node-reference/voice/voice-gateway/play.md)
>
> The Play Node\[^1] lets you stream a sound file into the call, also in a loop. The Node supports encoded MP3 and WAV files.

> [card] [Send Metadata](https://docs-classic.cognigy.com/ai/agents/develop/node-reference/voice/voice-gateway/send-metadata.md)
>
> The Send Metadata Node sends metadata via SIP INFO messages to the connected SIP trunk.

> [card] [Set Session Config](https://docs-classic.cognigy.com/ai/agents/develop/node-reference/voice/voice-gateway/set-session-config.md)
>
> The Set Session Config Node configures the Voice Gateway session. This configuration applies for the rest of the session unless overwritten, either directly or by activity parameters.

> [card] [Transfer](https://docs-classic.cognigy.com/ai/agents/develop/node-reference/voice/voice-gateway/transfer.md)
>
> The Transfer Node lets you transfer an ongoing call to a Tel or SIP target.

[^1]: This Node can be configured with [Parameter Details](https://docs-classic.cognigy.com/ai/agents/develop/node-reference/voice/voice-gateway/parameter-details.md).


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