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

# Edit a campaign

> When you can change campaign settings, and what to do once a campaign is running.

Outbound campaigns are editable **only before they start dialing**, when their status is **Draft** or **Scheduled**. Once a campaign is running, the API rejects edits with a 409 response: *"Campaign is no longer editable. Please duplicate it and try again."*

## Edit a draft or scheduled campaign

While a campaign is in **Draft** or **Scheduled** status, you can edit:

* Campaign name
* Contact list (`recipients`)
* Call script and call details (`userPrompt`)
* Voice and voice settings (Speech Rate, Stability, Similarity Boost)
* AI Speaks First first message
* Voicemail message
* SMS follow-up template and SMS data (meeting link, sender name, promo code)
* Email follow-up template and missed-call email template
* Schedule (calling hours, days of week, daily call limit)
* Call forwarding number and Warm Transfer toggle
* Background ambiance (Background Sound)
* Keypad dialing toggle
* Industry and language
* Scheduled launch date/time

## Duplicate a campaign

**Duplicate** is a first-class action, not just a workaround. You can reach it in three places:

* Any campaign row's ⋮ menu.
* The bulk **Duplicate Campaigns** action, after choosing multiple rows on the campaign list.
* The campaign's detail page.

hyzl creates the duplicate as a **Draft** with all settings copied, ready to edit and launch.

## Once a campaign is running

You cannot edit a running campaign. If you need to change something:

1. Open the campaign from the dashboard.
2. Click **Cancel Campaign**.
3. Duplicate the campaign to create a new one from it.
4. Edit the duplicate while it is still in **Draft**.
5. Launch the duplicate.

## Cancel a campaign

Cancelling stops a running campaign permanently. Calls already placed are preserved in the results. Remaining queued contacts will not be called.

<Warning>
  Cancel a campaign only when you are sure. The cancellation is irreversible and
  there is no pause or resume. To dial the remaining contacts after you cancel,
  duplicate the campaign.
</Warning>