> For a complete page index, fetch https://docs.synthflow.ai/llms.txt. For full documentation content, fetch https://docs.synthflow.ai/llms-full.txt.

# RingCentral

> Compare Synthflow's RingCentral integrations, the native RingCX IVA integration and the legacy RingEX SIP-extension setup.

RingCentral has two products that connect to Synthflow in different ways. **RingCX**, RingCentral's contact center platform, routes voice queue calls into Synthflow natively. **RingEX**, RingCentral's business phone system, connects through a SIP-extension setup that is being sunset and is no longer recommended.

For RingEX, we recommend forwarding your RingEX number over the PSTN to a [Synthflow number](/phone-numbers#buy-a-number) or a [Twilio number](/phone-numbers#bring-your-twilio-numbers). You can also use the RingCX integration, or [route calls directly to Synthflow](/route-sip-calls). Talk to your account manager to choose the right path.

## Integrations

#### [RingCX](/ringcx)

Run Synthflow as an Intelligent Virtual Agent (IVA) in RingCX voice queues. Recommended for RingCentral contact centers.

#### [RingEX](/ringex)

Legacy SIP-extension setup, kept for existing deployments while it is sunset.

## Comparison

|                            | RingEX SIP extension (legacy)                                                                                                          | [RingCX](/ringcx)                                                                                                                                          |
| -------------------------- | -------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **What it is**             | RingCentral's cloud business phone system (RingEX, formerly MVP)                                                                       | RingCentral's contact center platform                                                                                                                      |
| **Integration model**      | Synthflow registers *to* RingCentral as a SIP IP phone (extension)                                                                     | RingCX routes voice queue calls *into* Synthflow as an Intelligent Virtual Agent (IVA)                                                                     |
| **Synthflow number setup** | Add the number on the **Phone Numbers** page with RingCentral SIP credentials. The **Termination URI** is your RingCentral SIP domain. | Import the workflow channel number with **Phone Provider** set to **RingCX**. The **Origination URI** is filled in for you (`sip:sip.synthflow.ai:32681`). |
| **RingCentral-side setup** | Provision a generic SIP IP phone in the Service Portal                                                                                 | Create an IVA integration and build a workflow in Workflow Studio                                                                                          |
| **Call transfers**         | Warm and cold transfers (SIP or PSTN) work normally                                                                                    | Not supported from Synthflow. Return the call with the **RingCX Handoff** action.                                                                          |
| **Other limits**           | No outbound calling. Maximum 5 concurrent calls per extension.                                                                         | Caller context is passed through a JavaScript node. Calls return to the RingCX workflow.                                                                   |

## FAQ

#### Why is the RingEX SIP-extension integration being sunset?

The SIP-extension setup depends on RingCentral behavior outside Synthflow's control, so we can no longer guarantee its reliability. The [legacy setup](/ringex) stays documented for existing deployments, but we do not recommend it for new ones.

#### Do these integrations require the Enterprise plan?

Yes. SIP trunking and the RingCentral integrations are available on the Synthflow Enterprise plan.

#### Can Synthflow make outbound calls on RingCentral?

Not from a RingEX SIP extension. RingEX SIP extensions registered through Synthflow cannot place outbound calls, so use a [Synthflow number](/phone-numbers#buy-a-number) or a [Twilio number](/phone-numbers#bring-your-twilio-numbers) instead. With RingCX, Synthflow handles inbound voice queue calls routed from the RingCX workflow.

> Choose between the RingCX integration and the legacy RingEX setup.

## Docs

- [RingCX](https://docs.synthflow.ai/ringcx.md): Route RingCX voice queue calls to a Synthflow agent over SIP through an Intelligent Virtual Agent (IVA) integration.
- [RingEX](https://docs.synthflow.ai/ringex.md): Legacy setup that registers Synthflow as a SIP extension on RingCentral RingEX, kept for existing deployments while it is sunset.