Voice AI Agent Versioning in ZipLeads lets you create drafts, test changes, compare versions and publish updates without interrupting live calls.

Version history helps you track previous configurations, see what changed and restore an earlier version when needed. Because draft and live versions are kept separate, you can improve your Voice AI agents while callers keep getting a consistent experience.

Voice AI Agent Versioning is a version control feature. It lets you manage changes to your agent without immediately affecting the configuration used for live calls. Instead of editing the active version directly, you create a draft, make your changes and test them before publishing.

Each saved version is an agent configuration. It can include the agent's prompt, voice, model, actions, MCP integrations, Knowledge Base connections and post-call settings.

Version history also lets you compare configurations, review previous changes and restore an earlier version when necessary.

For example, if you want to update your agent's greeting or change how it answers customer questions, you can make those changes in a draft, test the new behaviour and publish only when you're happy with the results.

Important: Agent Versioning is available through Labs → Agent Versioning. It supports prompt-based Standard and Realtime Voice AI agents. It does not support agents created with the Flow-Based Builder.

Version history shows how your agent's configuration has changed over time. Each saved version includes identifying details, so you can review previous configurations, see which version is currently live and pick an earlier version to compare or restore.

The Version history panel shows your agent's saved versions and any current draft.

Each entry can include:

For example, your agent might have v1 marked as Live while v3 is the newest saved version. This means v1 is still the active configuration, even though a newer numbered version exists.

The live version is read-only. To change it, you need to create a draft.

Version Limit: Each Voice AI agent supports up to 20 versions. You can delete older versions to free up space.

Drafts give you a separate workspace for changing your agent without touching its active configuration. You can adjust prompts, voice settings, actions and other supported settings while callers keep talking to the live version.

You can create a draft from:

Each Voice AI agent supports one draft at a time.

When a draft exists, it appears separately in version history, so you can tell the editable configuration apart from saved versions.

Knowing the difference between draft and live versions helps you avoid accidental changes to live customer conversations.

Important: Creating a draft doesn't automatically make it live. Your existing live version stays active until a different version is published or made live.

Testing lets you confirm your agent behaves as expected before customers hear the changes. Voice AI Agent Versioning lets you test draft configurations separately from the version currently handling live calls.

When testing, check which version is selected and any information shown in the Test Audio panel.

For example, if v1 is live and v3 is the newest saved version, the Test Audio panel may show that test calls run v1 rather than v3.

This helps you avoid testing the wrong configuration.

ZipLeads gives you two main ways to test Voice AI agents.

Web Call

Web Call lets you talk to your agent directly through your browser's microphone.

Use Web Call to check:

Web Call doesn't support testing Call Transfer.

Phone Call

Phone Call testing lets you check your agent over a real phone connection.

Use Phone Call when you need to check:

For detailed testing requirements and call logs, see How to Test Voice AI Agents.

Version comparison shows you what changed between two configurations before you publish or restore. Instead of checking each setting by hand, you can look at highlighted differences or view the full configuration of a selected version.

The Compare versions window has two views:

The Changes view highlights the differences between two selected agent versions.

Choose the versions you want to compare using the version dropdown menus.

For system prompt changes:

For example, if a sentence in the agent's system prompt is changed, the comparison highlights the removed and added text.

This makes it easier to spot unintended prompt changes before making a version live.

The Full configuration view shows the settings stored in a selected version.

Depending on how your agent is set up, this can include:

Use this view when you want to look at the overall configuration of an earlier version, rather than just the differences between two versions.

Publishing and restoring let you control which configuration handles live conversations. Publishing puts a new configuration live from a draft. Restoring makes an earlier saved version active again.

When you publish an edited draft, ZipLeads creates a new saved version and makes that configuration live.

Publish when you've finished testing a change and want your agent to start using the updated configuration for live calls.

Before publishing, review the changes and make sure the draft behaves as expected during test calls.

Restoring lets you go back to a previous supported configuration without rebuilding its settings by hand.

Use the Make live option to activate the selected supported version.

For example, if a recently published configuration isn't giving the results you expected, you can select an earlier version from version history and make it live again.

Once an older version is made live, it becomes read-only. To make more changes, create a draft from that version.

Important: The newest numbered version isn't always the live version. Always check the Live badge to see which configuration is currently active.

Version limits and model availability affect which configurations you can keep and reuse. Understanding these limits helps you manage version history and keep older configurations available when you need them.

Each Voice AI agent can keep up to 20 versions.

When you reach the limit, you can delete older versions to make room for new ones.

Review older versions from time to time and keep any that may be useful for comparing or restoring.

A previously saved agent version may use a model that's no longer supported.

If a model has been retired:

This makes sure any change to the underlying AI model is intentional.

Tip: Test the replacement model before publishing, as different models may respond differently to the same instructions.

Q: Can I create multiple drafts for the same Voice AI agent?

No. Each Voice AI agent supports one draft at a time.

Q: Can I make changes directly to a live version?

No. Live versions are read-only. Create a draft from the live version to make changes.

Q: What happens if the model used by an older version is retired?

You need to select a supported replacement in a draft. The saved version stays unchanged, and the replacement needs your consent and must be published.

Q: Can I compare versions that aren't currently live?

Yes. The comparison window lets you select any saved versions to review.

Q: Why does my agent show a newer version number than the live version?

The newest saved version and the live version aren't always the same. The Live badge shows which configuration is currently active.

Q: Does Agent Versioning support Flow-Based Builder agents?

No. Agent Versioning currently supports prompt-based Standard and Realtime agents, not Flow-Based Builder agents.

Q: What happens when I reach the version limit?

Voice AI agents support up to 20 versions. You can delete older versions to free up space.

Q: Does restoring an older version make it editable?

No. Restoring a version makes it live and read-only. Create a draft from that version to make further changes.