[Outages-discussion] [outages] Verizon outage

[James Sharp]

On 9/30/24 10:55 AM, jrk1231-outml--- via Outages-discussion wrote:
> FYI... for most cellular providers, if you are using WiFi calling, then 
> you are using your WiFi/Internet provider's network to place calls, NOT 
> your cellular network (as per T-Mobile Engineering).
> 
> I had an issue last week where WiFi calls failed, but celluar calls 
> worked. T-Mobile said that was because my ISP was having a WiFi calling 
> outage, but the rest of their network was working. (The next day, their 
> business-class cable experienced a system-wide outage for about 19 hrs.)
> 
> Just a heads-up.

T-mobile lied to you.  Your ISP has nothing to do with the call handling 
other than they pass the IP traffic on up the road to Tmobile.

Wifi Calling just means that the call setup/audio/call teardown messages 
are carried over an IPSEC tunnel from your phone to the cellular 
provider's switch instead of being carried over the air.