Sendbird video call "Couldn't gather call quality data". voip notification does not work

i’m facing issue that our app sometimes voip notification work, but sometimes voip notification does not work.

I saw “Couldn’t gather call quality data or the participant may have been using SDK version 1.3 or earlier.” in dashboard page.

our SendBirdCalls SDK version : 1.9.5
how can i solve this problem?

call log when voip does not work

call log when voip work