> ## 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. # Voice Gateway Verbs > Voice Gateway includes verbs to help you build voice AI Agents, including dial, hangup, listen, gather, and speech configuration with Code Node examples. To create a voice AI Agent, you need to build a Flow on the Cognigy.AI side using [Voice Nodes](/ai/agents/develop/node-reference/voice/voice-gateway/overview). These Nodes provide the basic verbs required for your voice agent. If you require additional verbs that are not available in the Voice Nodes, you can add them using a [Code Node](#custom-verbs-in-code-nodes). For incoming calls, you can use Voice Nodes and a Code Node. However, for outgoing calls, you must specify all parameters in the call request body, as described in the [Advanced Configuration Request](/voice-gateway/creating-outbound-calls#advanced-configuration-request) section. ## List of Verbs The table presents the list of supported verbs. | Verb | Description | Node Analogue | | ------------------------------------------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------- | | [Answering Machine Detection](/voice-gateway/references/verbs/amd) | This verb can be enabled on outbound calls to provide an indication of whether a call has been answered by a person or a machine. To use this feature, provide the `amd` property in a [dial](/voice-gateway/references/verbs/dial) verb. | [Transfer](/ai/agents/develop/node-reference/voice/voice-gateway/transfer) (**Dial > Answering Machine Detection** settings) | | [Config](/voice-gateway/references/verbs/config) | This verb lets the developer modify the default speech settings for the current session or to collect speech or DTMF input in the background while other verbs are executed. | [Set Session Config](/ai/agents/develop/node-reference/voice/voice-gateway/set-session-config) | | [Dial](/voice-gateway/references/verbs/dial) | This verb initiates a new call by connecting to a telephone number, registered SIP user, or SIP URI. | [Transfer](/ai/agents/develop/node-reference/voice/voice-gateway/transfer) (**Dial** settings) | | [Dub](/voice-gateway/references/verbs/dub) | This verb adds a background audio track to the conversation. | [Set Session Config](/ai/agents/develop/node-reference/voice/voice-gateway/set-session-config) | | [DTMF](/voice-gateway/references/verbs/dtmf) | This verb generates a string of DTMF digit signals, which are transmitted as RTP payloads according to [RFC 2833](https://datatracker.ietf.org/doc/html/rfc2833). | [DTMF](/ai/agents/develop/node-reference/voice/voice-gateway/dtmf) | | [Gather](/voice-gateway/references/verbs/gather) | This verb collects DTMF or speech input. | - | | [Hangup](/voice-gateway/references/verbs/hangup) | This verb terminates the call and ends the session. | [Hangup](/ai/agents/develop/node-reference/voice/voice-gateway/hangup) | | [Listen](/voice-gateway/references/verbs/listen) | This verb sends real-time audio streams to your application over a WebSocket connection for processing. The [Call Recording](/voice-gateway/webapp/recent-calls#call-recordings) feature relies on this verb. | [Call Recording](/ai/agents/develop/node-reference/voice/voice-gateway/call-recording) | | [Play](/voice-gateway/references/verbs/play) | This verb streams recorded audio to a call. | [Play](/ai/agents/develop/node-reference/voice/voice-gateway/play) | | [Say](/ai/agents/develop/node-reference/basic/say) | This verb sends synthesized speech to the remote party. The text provided may be either plain text or use SSML tags. | [Say](/ai/agents/develop/node-reference/basic/say) | | [SIP:request](/voice-gateway/references/verbs/sip-request) | This verb sends a SIP `INFO`, `NOTIFY`, or `MESSAGE` request on an established call, which is an in-dialog request. | [Send Metadata](/ai/agents/develop/node-reference/voice/voice-gateway/send-metadata) | | [SIP:refer](/voice-gateway/references/verbs/sip-refer) | This verb transfers a call and disconnect. | [Transfer](/ai/agents/develop/node-reference/voice/voice-gateway/transfer) (**Refer** settings) | | [Transcribe](/voice-gateway/references/verbs/transcribe) | This verb generates real-time transcriptions of speech. | [Set Session Config](/ai/agents/develop/node-reference/voice/voice-gateway/set-session-config) (**Recognizer - Speech-To-Text** settings) | ## Custom Verbs in Code Nodes The example shows how a [Code Node](/ai/for-developers/code/overview) can send a customized [`dial`](/voice-gateway/references/verbs/dial) verb with an Answering Machine Detection (`amd`) action hook. ```js theme={null} api.output(null, { "_cognigy": { "_voice-gateway2": { "json": { "verb": "dial", "actionHook": "dial", "callerId": "+49XXXXXXXXXXX", "target": [ { "type": "phone", "number": "+49XXXXXXXXXXX", } ], "amd": { "actionHook": "amd", "recognizer": { "vendor": "microsoft", "language": "en-US", } } } } } }) ``` ## More Information * [Voice Gateway Events](/voice-gateway/references/events/overview)