Call monitor

[sidatacom]

We use skype for business as main phone system and have actually a solution migrated from tapi in the lync client sdk.

I have the question if it is possible to use the UCWA SDK to monitor an incoming phone audio call ?

I use client.ConversationAdded += Client_ConversationAdded; but the event is never raised.
I found some information about this:

Azure Active Directory scopes for online applications
The user must have at least one of these scopes for operations on the resource to be allowed.

Conversations.Receive | Receive conversation invites |
Allows the app to receive instant messages, audio, video, and desktop sharing invitations on-behalf of the signed-in user

So it should possible over UCWA to get an event for audio call invitation ?

Regards
Alexander