> For the complete documentation index, see [llms.txt](https://docs.bird.com/toky-en/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bird.com/toky-en/how-to-guidestokyapp/display-an-external-phone-number-as-a-caller-id.md).

# 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.**