Yesterday, I found a problem that after successfully making a new subscription, there is no webhook posted to the specified URL while the RingOut call is in progress.
So far, when my app subscribes for the events (mentioned below), I see that the whole process go through just fine and my webhook endpoint always gets something back from RingCentral. However, after that, there is no postback to that webhook endpoint so far.
The webhook endpoint is always accessible and operational without issue.
At the moment, I believe that there is no postback from RingCentral but I am not so sure about that.
I would like some guidance how to investigate this issue.
Steps to reproduce the problem:
Make a new subscription or ignore if there is an active webhook subscription for the following events:
Make a RingOut call.