# PSTN (Sim-Based IVR Call)

{% embed url="<https://youtu.be/w2o-BVWcrns>" %}

### PSTN stands for Public Switched Telephone Network.

***

In PSTN call functionality, the first call is **directed** to the user's phone through a virtual number when a user initiates a call. Once connected, the call is then **routed** to the intended person, customer, or lead.&#x20;

{% hint style="success" %}
Importantly, both parties involved in the call can only see the **virtual number**; the personal details and actual phone numbers of both parties remain **hidden** from each other for **privacy**.
{% endhint %}

***

<figure><img src="/files/g22AE0aCCYaWI8e8Emcl" alt=""><figcaption></figcaption></figure>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.neodove.com/admin-portal/marketplace-ivr/ivr-services/pstn.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.