How to get Main Site/Company Default IVR settings?

Hello,

I’ve been using the Multi-Site IVR Settings API to fetch our sites' IVR settings, and it has been working great.

However, the API documentation states:

Internal identifier of a site. Please note that siteId cannot take the main-site value.

Is there any way to retrieve this information through another API call?

Our Main Site IVR settings are used as the defaults for many of our IVR menus, but there currently doesn't seem to be a way for us to retrieve the default values for No Input, #, or * from the Main Site.

Thank you.