Initially I thought that it may be the attention aware feature and i tested it. The phone still does not make the call waiting beep during ongoing whatsapp call.
when my airpods are not connected the phone lights up next to my ear but does not make the call waiting beep in the earpiece.
i am running 13.3. If someone has the 11 pro max and they use whatsapp, maybe it can be tested if other users also face this issue. I have seen multiple threads of people complaining about the same issue but there seems to be no solution.
Its not a carrier issue. i switched from a samsung. It always gave the call waiting beep in the airpods or without the airpods. Even this phone did it a few times when i first got it. But i started missing calls and realized its not beeping during ongoing whatsapp calls.
I restarted the phone and tested it. I had my mum call me (over my carrier) while i was on an ongoing whatsapp call. The phone beeped. Then an hour later i tested again (same way). Didn’t work. I cant restart my phone after every call just so this basic call notification works.
i hope its not a bug. Bc that means there is no solution unless apple fixes it at the software level.