To see and modify the caller ID settings, in the calling system's admin area, on the Projects | Activity page, click on the row of the campaign to select it and then click on the green "Edit" button above.
On the first tab of the campaign settings (“Projects”), scroll down to the “Caller ID” section.
The DID dropdown menu shows the caller ID options. Choose the appropriate option. (The campaign and global “Rotation 2” options are the same as the campaign rotation and global rotation options – you can choose either.) If you are using the “Campaign” option – a single number for all of the calls – put that number in the “Project CallerID” box.
Click on "Save" in the upper right, then "Yes" to the question about regenerating the IVR.