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