# PSTN (Sim-Based IVR Call)

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### PSTN stands for Public Switched Telephone Network.

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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;

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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**.
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<figure><img src="https://2103666731-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MJasmeOMeAJhTVh0M75%2Fuploads%2FWCCpFGqq6C6w6KlPb8FT%2FPSTN.png?alt=media&#x26;token=252cb7c6-de04-4392-bc34-51843ca42215" alt=""><figcaption></figcaption></figure>