Outbound Campaign API returning 400 when filtering by legal hold metadata

General Discussion
1

Looking for advice on a 400 Bad Request error when calling POST /api/v2/analytics/outbound/details with a custom legal_hold filter.

Background

We are using the Recording API v2 to identify sessions flagged for legal discovery. The goal is to pause or divert outbound dialing campaigns immediately when a match is found.

Issue

The request fails with:

{"code":"bad.request","message":"Invalid filter syntax for field: custom.legal_hold"}

This occurs despite the field existing in the Architect flow.

Troubleshooting

  • Verified the custom data key legal_hold is correctly mapped in the dialer settings.
  • Tested the same filter in the Inbound API, which works correctly.
  • SDK version: Python 2.15.0.
2

resource “genesyscloud_routing_outbound_campaign” “legal_hold” {
name = “Legal Hold Divert”

Ensure filter syntax matches v2 schema exactly

rule {
name = “LegalHoldCheck”
type = “AND”
conditions {
name = “legal_hold_status”
op = “EQUALS”
value = “true”
}
}
}

The **400 Bad Request** typically stems from invalid JSON structure in the `POST` body or unsupported filter operators in the **analytics API**. The outbound campaign filter itself should reside in the **routing module**, not the analytics query. Verify that the `legal_hold` field is correctly mapped in the **data masking** or **custom attribute** definitions. If using Terraform, ensure the `genesyscloud_routing_outbound_campaign` resource explicitly defines the **rule conditions** with valid operators.

Check the **API documentation** for `outbound/details` to confirm if `legal_hold` is a valid query parameter. Often, custom metadata requires specific **attribute IDs** rather than raw names. Run a `terraform plan` to detect any **state drift** in the campaign configuration. If the issue persists, isolate the filter in a **test environment** and inspect the raw **HTTP request** via browser dev tools or Postman to identify syntax errors.
3

What’s happening here is that the outbound analytics endpoint does not support arbitrary metadata filtering for legal hold status directly in the query payload. The 400 error indicates schema validation failure, not a logic error. You are likely passing a filter object that the API parser rejects because legal_hold is not a standard field in the outbound details schema. Instead of trying to filter at query time, you should query the recording API first to get the list of held session IDs, then cross-reference those IDs against the outbound campaign data. This separation prevents API rejection and handles the data volume more predictably.

For load testing purposes, ensure you are not hitting rate limits during this two-step process. If you are using JMeter, set the thread count to 50 and add a 200ms delay between requests. This mimics realistic user behavior and avoids triggering 429 errors. The documentation suggests that complex filtering should be handled client-side after data retrieval. This approach also helps with capacity planning, as you can monitor API throughput separately for recording and outbound queries. Keep the concurrent calls low to ensure stable performance during the validation phase.