Skip to main content
The n8n-nodes-slng community node brings SLNG into your n8n workflows. It adds two nodes: SLNG, an action node for text to speech, speech to text, and outbound agent calls, and SLNG Trigger, which lets a voice agent call a workflow as a tool during a call.

​
Prerequisites

​
Install the node

slng-ai/n8n-nodes-slng
Loading repository data...
1

Open Community Nodes

In n8n, go to Settings then Community Nodes and click Install.
2

Install the package

Enter n8n-nodes-slng and confirm.
3

Restart n8n

Restart n8n so the nodes load. Do this again after each update.

​
Add your SLNG credential

Both nodes authenticate with one credential.
1

Create the credential

Add a new SLNG API credential and paste your key. n8n validates it against GET https://api.slng.ai/v1/me.
2

Reuse it across nodes

The same credential covers the Voice API (api.slng.ai) and the Agents API (api.agents.slng.ai), so every SLNG node in a workflow can share it.

​
The SLNG node

The SLNG node runs one operation per item. For Dispatch Call, the node confirms the agent has outbound telephony set up before it places the call. The Model and Voice fields are dropdowns filled live from the model catalog, and the voice list follows the text to speech model you pick. Switch either field to By ID to enter a model path or voice ID directly.

​
The SLNG Trigger node

The SLNG Trigger node starts a workflow when a voice agent calls it as a tool, mid-conversation. Use it to look something up, write to another system, or run any logic while the call is live.
  • Tool type: an LLM tool the agent chooses to call, or a System tool tied to a call lifecycle event.
  • Authentication: verify incoming requests with HMAC or a Bearer token.
  • Response mode: reply with Using Last Node to return a node’s output to the agent, or Immediately to acknowledge and keep working.
Read the agent’s arguments from toolArguments, not $json.arguments. To wire a workflow up as an agent tool, see Use n8n for tools.

​
Next steps