Teams PSTN and Zscaler

Hello All,

Does anybody have some experience with Teams PSTN calling and Zscaler? On one of our branch they started to test that feature, and they are experiencing some random and intermittent issues with call quality, voice is braking out or even with disconnections. Normal teams calls seems to be good.
It is related to the users working from office, where we have only static tunnels towards Zscaler.

I have found this article on web Shawn Harry | Zscaler and Microsoft Teams Media Optimisation
where general thesis is that there is no value for directing this kind of traffic to Zscaler and even it can make problems (but it is quite old though, something might changed).