# Caller Based Router
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Read this if you have Smart Apps in use that have been ordered before 21 october 2024. New Smart Apps documentation can be found within the [Marketplace](/store/marketplace-apps.md).
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The Callback Based Router allows you to route directly from number to number. This can be from external to extension, extension to external, extension to extension and vice versa. This creates a structured workflow in which you can create the desired routings without any effort.
### Using the Called Based Router
When you want to start routing numbers you need to do the following steps:
1. Navigate to the left menu.
2. Click on Content.
3. Go to Routing Table.
4. Fill in the Caller.
5. Then fill in the designated destination that the caller needs to be routed to.
As you can see in the image above, you see that the **caller**, the person who is calling, is routed to the **target**, or the desired destination. After you connected a public number to your Caller Based Router and start calling this number, the **caller** (+31612345678 in this situation) will be routed to the **target**.
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