# Display an external phone number as a Caller ID

You can display a custom phone number in the caller ID, different from the one provided by Toky. If you need this masking, please ask our customer service.

This masking only works for outbound calls, and you can't receive inbound calls at that custom number in Toky.

**This configuration does not require the custom number to follow the porting process.**


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# 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.bird.com/toky-en/how-to-guidestokyapp/display-an-external-phone-number-as-a-caller-id.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.