> ## Documentation Index
> Fetch the complete documentation index at: https://docs.asisso.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Webhook
> Webhook node allow you to sync the result of Voice Agent runs to your external systems, like CRM or to other workflow orchestrator like Zapier or n8n.
## Video Tutorial
You can have multiple Webhook Nodes for a single Voice Agent, if you want to sync the result of the call at multiple places.
### Creating the Webhook Payload
The payload can contain a valid JSON, and you can reference variables while constructing that payload. You can reference below variables while constructing the payload.
* `{{workflow_run_id}}` Unique ID of the Agent run
* `{{workflow_id}}` ID of the Agent
* `{{workflow_name}}` Name of the workflow
* `{{campaign_id}}` ID of the campaign this run belongs to (empty for ad-hoc runs)
* `{{call_time}}` ISO-8601 UTC timestamp of when the call was initiated
* `{{initial_context.*}}` [Initial context variables](/core-concepts/context-and-variables#initial_context)
* `{{gathered_context.*}}` [Extracted variables](/core-concepts/context-and-variables#gathered_context)
* `{{cost_info.call_duration_seconds}}` Call duration
* `{{recording_url}}` Call recording URL
* `{{transcript_url}}` Transcript URL
For the full list of available variables, authentication options, and receiver examples, see the [Webhook Payloads developer reference](/developer/webhooks).
An example of the payload is given below
```
{
"call_id": "{{workflow_run_id}}",
"first_name": "{{initial_context.first_name}}",
"rsvp": "{{gathered_context.rsvp}}",
"duration": "{{cost_info.call_duration_seconds}}",
"recording_url": "{{recording_url}}",
"transcript_url": "{{transcript_url}}"
}
```