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# 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="/files/g22AE0aCCYaWI8e8Emcl" alt=""><figcaption></figcaption></figure>