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

# Why Does the utm_source Value Show a URL, or Not Present?

> If Capture Organic Sources is enabled and UTM parameters are missing, Invoca fills in the referral domain instead — and out-of-session calls may show no UTM data at all.

<Note>
  Invoca is migrating Dashboards and Reports to the newer Insights & Analytics experience. See [Insights & Analytics: Getting Started Guide](/s/article/insights-analytics-getting-started-guide) to check out the new experience.
</Note>

## Applies to

* Invoca Call Report
* UTM values

## Answer

If the "Capture Organic Sources" setting is enabled in your Invoca Tag configuration, then whenever UTM parameters are missing, `utm_medium` is set to "Organic" and `utm_source` is set to the referral domain instead.

Out-of-session calls may also show no UTM data. Repeat callers are a common example of an out-of-session call — such as a caller dialing back from a previously saved number. Invoca also identifies out-of-session calls by checking for duplicate Invoca Unique IDs, which are assigned to indicate a single web session.

## Where to go next

* [Capturing Marketing Data](/s/article/capturing-marketing-data)
* [Attribution Model Comparison](/s/article/attribution-model-comparison)
* [Reset Attribution Cache](/s/article/reset-attribution-cache)
* [Why Are There Pooling Calls With No Dynamic Marketing Data Attribution?](/s/article/pooling-calls-no-dynamic-attribution)