Install zoom client on CP960

[gnieradka]

I found some paper about provisioning Deploying and Managing the Applications on Yealink Smart Business Phones
unfortunately, the manner is described for other models than CP960.
But based on these document I made web server where I put the Zoom application in xapk format.
I downloaded the config file from the phone and added line with the description where the Zoom apk file is located, namenly app.install_url = address to apk file
And when I tried to make auto provisioning I obtained communicate that everything was sucessfull but I can not see the zoom application installed on the phone.
So I suppose that something was wrong with the installation during provisioning. I expected that I would see zoom application installed on the phone.
Unfortuantelly I'm not able to find any different instruction about installing software on the CP960 conference system.
If it could help I can describe my approach even with screenshots what I tried for intalling the zoom application.