# Add Caller ID to Voice Mail Headers

You can configure mailboxes to include Calling Line ID (CLI) in the headers of voice mail viewed using Web View, or accessed via telephone.

Customize an FCOS to include the following feature bits in the required mailboxes:

- 263 (Store Caller Line ID as a Phone or Mailbox Number)

- 264 (Play Outside Caller User Interface for CLI Capture)

Parent topic: NuPoint Voice Application