Whatsapp 2.20.121 (11/2020) still running iPhone 4s?

[Xde]

Hello...
I am working in WIFI from a home router with an iPhone 4s
Since two weeks or so, I notice, that I cannot connect successfully a video or audio call. Text-Chat is ok.
WA trys to connect, its not everytime ringing on the other side.
When the other phone attends, the connection breaks off and WA trys to reconnect. Without success.

Can please anyone confirm, that WA connections and calls are still working on a 4s ?

I am trying to find the problem, but I am lost in the moment.
BTW a newer iPhone over the same WIFI network works fine.

I am not sure, but maybe its since the last update 2.20.121 from 11_2020
Sadly I have no old verion in iTunes.
Thank you much...

(Edit: iPhone 4s)

 

[Xde]

Got it...
WA works perfectly.
The problem is in my own network, while connecting two iphones inside the same network.
I dont know what it es exactly.
Maybe it has to do with the fact the my WA account is using a line telephone number.
The router seperates it from connected devices, like telephone, FAX etc.,
When I do a Whatsapp call to outsides, it works fine.