***

title: Build agents with Synthflow AI
subtitle: null
slug: getting-started
description: null
-----------------

Meet your AI-powered voice agent. Synthflow AI helps businesses automate conversations by handling both inbound and outbound calls. Your agent can answer questions, engage customers, and streamline operations—so you can focus on what matters most.

## The BELL Framework

Synthflow organizes the entire agent lifecycle around the **BELL** loop—**Build**, **Evaluate**, **Launch**, and **Learn**. This is the operating system behind every polished experience we deliver: a repeatable rhythm that helps teams move from idea to world-class conversations without losing speed or quality.
![BELL framework overview](https://files.buildwithfern.com/synthflow.docs.buildwithfern.com/1d42edc33f50ad47985aa24c17d36c65dde4866500fbd2de834f44a621a906b3/docs/assets/screenshots/BELL.png)

### Build

Design and integrate voice agents. Define, connect, and shape behavior in a clear, reviewable flow. Keep logic predictable so your team can trust every path.

* [Quickstart](/create-an-agent)
* [Call flow designer guide](/flow-designer)
* [Knowledge base](/create-a-knowledge-base)
* [Voice](/voice-configuration)
* [Actions](/actions-overview)

### Evaluate

Simulate and evaluate before going live. Run realistic conversations in safe environments, validate flows end-to-end, and add checks that reflect your domain and compliance needs.

* [About simulations](/simulations)
* [Custom evaluation workflows](/create-a-custom-evaluation)

### Launch

Deploy and scale with confidence. Govern rollouts, trace behavior with execution logs, and manage releases with the ability to safely roll back. Integrate cleanly into your applications and systems.

* [Integrated platforms](/about-integrations)
* [Webhooks](/about-webhooks)

### Learn

Monitor and improve continuously. Close the loop with insights, spot gaps, and refine flows. Track usage, performance, and outcomes to keep quality high over time.

* [Analytics](/collect-analytics)
* [Export call data](/export-call-data)

## Integrations

Synthflow integrates with many platforms to fit into your stack. For the full catalog, visit [Integrated platforms](/about-integrations). Here we show some popular ones.

<CardGroup cols={1}>
  <Card title="Whatsapp" href="/whatsapp-business-calling" darkModeColor="#E4E4E7" lightModeColor="#1F293A" icon="brands whatsapp" iconPosition="left" iconSize="6">
    Deploy an agent that seamlessly accepts calls from WhatsApp Business Accounts.
  </Card>

  <Card title="Salesforce" href="/integrate-with-salesforce" darkModeColor="#E4E4E7" lightModeColor="#1F293A" icon="brands salesforce" iconPosition="left" iconSize="6">
    Embed Synthflow agents into your Salesforce workflows.
  </Card>

  <Card title="Stripe" href="/stripe-overview" lightModeColor="#1F293A" darkModeColor="#E4E4E7" icon="brands stripe" iconPosition="left" iconSize="6">
    Whitelabel our platform and manage your own customers.
  </Card>

  <Card title="HubSpot" href="/hubspot" darkModeColor="#E4E4E7" lightModeColor="#1F293A" icon="brands hubspot" iconPosition="left" iconSize="6">
    Embed Synthflow agents into your HubSpot workflows.
  </Card>
</CardGroup>

## Quick links

<CardGroup cols={1}>
  <Card title="Developer" href="/getting-started-with-your-api" lightModeColor="#1F293A" darkModeColor="#E4E4E7" icon="fa-code" iconPosition="left" iconSize="6">
    Follow our API Reference and automate your phone calls.
  </Card>

  <Card title="Concurrent calls" href="/cuncurrency-calling-limits" darkModeColor="#E4E4E7" lightModeColor="#1F293A" icon="fa-regular fa-phone" iconPosition="left" iconSize="6">
    Rate-limiting and queueing for enhanced reliability.
  </Card>

  <Card title="Whitelabeling" href="/about-agency-whitelabel" darkModeColor="#E4E4E7" lightModeColor="#1F293A" icon="fa-regular fa-palette" iconPosition="left" iconSize="6">
    Scale your business and provide a customized AI solution
  </Card>

  <Card title="Billing" href="/edit-your-billing-information" darkModeColor="#E4E4E7" lightModeColor="#1F293A" icon="fa-regular fa-credit-card" iconPosition="left" iconSize="6">
    Edit your billing information and upgrade your plan.
  </Card>
</CardGroup>

## More resources

<CardGroup cols={1}>
  <Card title="YouTube resources" href="https://www.youtube.com/@SynthflowAI" icon="brands youtube" iconPosition="left" darkModeColor="#E4E4E7" lightModeColor="#1F293A" iconSize="6">
    Watch tutorials, discover new features, and hear customer stories.
  </Card>

  <Card title="Help Center" href="https://helpcenter.synthflow.ai/" icon="fa-regular fa-circle-question" iconPosition="left" darkModeColor="#E4E4E7" lightModeColor="#1F293A" iconSize="6">
    Check our help center with popular articles and how-tos.
  </Card>

  <Card title="Academy" href="https://academy.synthflow.ai/home" icon="fa-regular fa-graduation-cap" iconPosition="left" darkModeColor="#E4E4E7" lightModeColor="#1F293A" iconSize="6">
    In-depth training and video tutorials to level up your team.
  </Card>

  <Card title="Changelog" href="https://feedback.synthflow.ai/changelog" icon="fa-regular fa-newspaper" iconPosition="left" darkModeColor="#E4E4E7" lightModeColor="#1F293A" iconSize="6">
    Subscribe to our changelog for the latest exciting updates and important bug fixes.
  </Card>

  <Card title="Status" href="https://status.synthflow.ai/" icon="fa-regular fa-signal" iconPosition="left" darkModeColor="#E4E4E7" lightModeColor="#1F293A" iconSize="6">
    Check the status of Synthflow services.
  </Card>
</CardGroup>

## FAQ

<AccordionGroup>
  <Accordion title="Will the agent use the name I set in configuration?">
    No, the agent will use the name you gave it in the prompt. It will not use the name you chose in the settings.

    For example, if you name your agent "AI Call agent for ACME" in the settings but name it Derreck in the prompt, it'll introduce itself as Derreck to clients.
  </Accordion>

  <Accordion title="Does the voice need to match the language?">
    Yes, the voice must match the language you are using.
  </Accordion>

  <Accordion title="Why do advanced voice tweaks change quality?">
    The advanced settings are tuned to sound the best in most scenarios. We suggest leaving them as is unless you need to make adjustments, and even then only make small tweaks so you don't degrade the voice quality.
  </Accordion>

  <Accordion title="Why is my agent reaching voicemail?">
    The voicemail detection rate is quite high for our agents, but specific voicemail recordings—especially those in the customer's own voice—can still pass through. If you want a better experience with voicemail, switch your Voicemail Detection setting to "Time based."
  </Accordion>

  <Accordion title="Why can't inbound agents use variables?">
    Inbound agents do not allow for variables because they won't know who is calling before the call. If you need the agent to reference information outside the application, create a Custom Action that calls the external app's API to fetch the data while the call is happening.
  </Accordion>

  <Accordion title="Are there Synthflow prompt templates?">
    Yes. We have prompt templates in the template section, and you can also use Copilot to build a prompt.
  </Accordion>

  <Accordion title="Can I use my own telephony app?">
    We do not currently offer custom telephone apps for customers on plans lower than the Enterprise level.
  </Accordion>

  <Accordion title="Can I query subaccount minutes via API?">
    At this time it is not possible to query subaccounts to find the minutes used.
  </Accordion>

  <Accordion title="Do subaccounts get their own minutes?">
    Subaccounts share the minutes of the agency account. You can place a subaccount on Pay as You Go by changing this setting when creating the pricing plan.
  </Accordion>

  <Accordion title="How are concurrent call limits shared?">
    Concurrency is set by your plan, and your accounts and subaccounts share the main account's total. For agencies, that's now 100 concurrent calls. If you need more, contact sales.
  </Accordion>

  <Accordion title="When does billing occur each month?">
    Billing happens on your renewal date. You can find this under **Settings > Plan and billing** in the "Next billing" section.
  </Accordion>

  <Accordion title="Can I move a subaccount between agencies?">
    It is not possible to import or export entire subaccounts.
  </Accordion>

  <Accordion title="How do I buy an Australian number?">
    Provide a valid address in Australia. Once you do, you'll be able to buy an Australian number.
  </Accordion>
</AccordionGroup>