Who said this isn't possible? Of course it is. Use the WebClient or Desktop app, put it in CSTA mode and select your IP Phone.And it seems there's no way to use both at the same time (for instance picking a conversation on the deskphone and with the app opened on the same discussion being able to pause recording)

Yes, it works then as well.Thanks @NickD_3CX but this is working for outgoing calls only?
What if the deskphone rings and the user just picks the call on the deskphone? Not working then?

To be honest, most modern PBX don't accept many features from deskphones. The goal is to ditch deskphones lol the apps work great and while having to use an app is not perfect, 3CX has an upcoming API which might give this ability, and thus would allow for custom templates to work with this.Yes I did deploy the Windows app.
But I've sold the Enterprise feature to my customer (with Yealink phones) based on what was written here.
Previously the customer had to use a Win app to start/stop recordings on their previous Aastra PBX and they really disliked it, they were happy not to have to use a Win app anymore.
So we get a little conflict when I told him that I was wrong, that they would have to do the same than with their old Aastra, since there is no such option in 3CX neither, even if said so on the checkbox,
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.