Guests Unable to log in from Indonesia

[zumurudi]

My teachers from Indonesia can not log in. We are an Australian-based institution. I have unblocked the regions so that they can log in, but they are still unable. 

I am using Windows.

Zoom version :

July 24, 2023 version 5.15.5 (19404)

[Ray_Harwood]

Welcome to the Zoom Community, @zumurudi.

The calling plan available by default is documented in this Zoom Support article:

https://zoom.us/zoomconference

The middle column is International (direct-dial) Numbers, and the right-side column is Tollfree Numbers.

Normally audio is easily obtained via the computer/internet, without resorting to telephone services.  Before pursuing a costly telephone plan to add these, I'd suggest verifying whether or not they can participate fully via an internet connection only.