Re: Wi-Fi Calling in a corporate environment

[Tom Beecher <beecher () beecher cc>]

My understanding has been that generally, if the cellular network signal
was above a certain threshold, phones won't even attempt to use wifi
calling. Some carriers used to let you flip a switch to force the phone to
prefer wifi over cellular, but some have removed that. ( Verizon for
example. )

In my experience some years ago in a similar environment, that
cellular threshold to switch was set so low that it was useless. I could be
standing in a spot with barely tickling the bottom bar, and nothing. If I
flipped to airplane mode, was able to wifi call instantly.

On Fri, Aug 2, 2024 at 11:11 AM <chuckchurch () gmail com> wrote:

> Hey all,
>
>
>
>                Question if anyone knows about cell phone wi-fi calling in
> US.  Googling isn’t finding what I’m looking for.  We have a corporate site
> in US where users have BYOD capability, and use their phones with wi-fi
> calling enabled.  Site uses a single NAT address (IPv4) for BYOD access.
> Recently the site reported wi-fi calling had stopped working for all user
> phones, Apple and Android, all about the same time.  The guest network did
> have some bandwidth limitation applied and they had overuse.  That was
> since resolved, we upped the bandwidth.  But the phones all still avoided
> wi-fi calling.  It’s a manufacturing site with known cell signal issues, so
> most users had no signal via carrier.  I did not get a packet capture yet
> to see what could be going on, we’re 99% sure we’re not blocking traffic.
> I’m wondering if the phones have an algorithm to test wi-fi signal, and
> perhaps the carriers will blacklist public IPs with known wi-fi calling
> issues to avoid cases where an emergency call can’t be made because of
> intermittent bad performance?  It seems odd that even when no bandwidth
> issues exist, it’s not attempted.
>
>
>
> Thoughts?
>
>
>
> Thanks,
>
>
>
> Chuck Church