> For the complete documentation index, see [llms.txt](https://docs.voipnumber.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.voipnumber.net/how-to/translate-speech-in-a-real-time-back-to-the-caller.md).

# Translate speech in a real time back to the caller

## Latency, robustness and reliability

On VoIP Number speech translation latency is 841 ms or less, which is just the right amount to provide user with natural conversation experience 

But does it matter how quick it is if it can't be trusted to stay consistent and reliable? Speech translation on our platform leverages best in class STT, translation and TTS from [Google Cloud Platform](https://cloud.google.com/gcp) that separates translation on [app.voipnumber.net](https://app.voipnumber.net/) from less reliable and less accurate solutions 

There is few more secrets that stand behind this, but these need to stay secret 🧙‍♂️

Let's setup a [Call Flow](/components/call-flow.md) for you to try it on your own account

{% embed url="<https://www.youtube.com/watch?rel=0&v=wrGlmw1KdCs>" %}

## Setup

1. Create a [Call Flow](/components/call-flow.md) with `Translate speech` [action](https://docs.voipnumber.net/tools-and-features/call-flow-builder#action-translate-speech) connected to `Echo` [action](https://docs.voipnumber.net/tools-and-features/call-flow-builder#action-echo)
2. Click on `Translate speech` action and select languages

<figure><img src="/files/Qt4JjYdniOEPVjYwTh8E" alt=""><figcaption></figcaption></figure>

3. (optional) You can also preceed it all with `Play text with AI` [action](https://docs.voipnumber.net/tools-and-features/call-flow-builder#action-play-text-with-ai) to announce (playback) any message on a call
4. (optional) You can attenuate input speech (as heard back on your device) below translated result. Click on `Echo` and select level of attenuation in dB

✅ You now have created a Call Flow that you can dial through SIP extension and SIP trunk. You can also get a telephone [Number](https://docs.voipnumber.net/components/number) to dial it from mobile and landline telephone networks


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