> For the complete documentation index, see [llms.txt](https://docs.inogic.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.inogic.com/whatsapp4dynamics/features/restrict-chat-with-unknown-number.md).

# Restrict Chat with Unknown Number

This feature allows you to manage communication strictly through verified contacts by limiting interactions with mobile numbers that are not saved in Microsoft Dynamics 365.

### **When Chat with Unknown is Disabled** 

<figure><img src="/files/dL2XeGaQIu6J3KukcRcd" alt=""><figcaption></figcaption></figure>

* Users can receive messages from unknown WhatsApp numbers.

<figure><img src="/files/cFSLvo7J5CSnOVOqGsxD" alt=""><figcaption></figcaption></figure>

* If a user clicks **Accept** when a new incoming message from an unknown number arrives, an **error message** appears on the chat UI.

<figure><img src="/files/ozRhjFgMlr6ssY6IP5gD" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/hGhI3GU54usW15x8OV2g" alt=""><figcaption></figcaption></figure>

To chat, the user must save the number in Dynamics 365.

* After that, the chat box is enabled.
* The user can now reply and continue the conversation.

<figure><img src="/files/gblyRjGZGkZMO5UFrOlP" alt=""><figcaption></figcaption></figure>

#### **When Chat with Unknown is Enabled**&#x20;

* Users can **chat with anyone**, even if the number is not saved in CRM.
* The Chat UI is **always enabled**, and no error appears.

<figure><img src="/files/aLT8XN5fYUxN9otW7zg1" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/sVMqaf953C4disr1yV2v" alt=""><figcaption></figcaption></figure>

This ensures secure, CRM-based messaging within the WhatsApp4Dynamics app.