Basically, you can create an AD Contact and set the **msRTCSIP-PrimaryUserAddress** parameter to be the URI of the VMR.

There is a rather nice blog by Tom Larsen that we have used life to bulk import Contacts into AD, which can be seen here  -https://blog.codesalot.com/2012/01/18/adding-external-contacts-to-the-lync-addressbook/.

There is also a blog post here from Graham Walsh here on creating contacts - http://www.graham-walsh.com/2016/08/adding-custom-sip-contact-skype-business-online/

This should not be seen as a recommendation from Pexip, rather just a friendly pointer, but I found this to work well.