geo9/geo10.t-mobile.com Returning NXDOMAIN for WiFi Calling

[Richard Laager]

Anyone have a good contact for T-Mobile authoritative DNS? I've had no 
response from dnsadmin at t-mobile.com.

My customers are reporting that T-Mobile WiFi calling (sometimes) does 
not work on our Internet service. This appears to be due to DNS 
resolution failures.

The cause of the failures seems to be that geo9.t-mobile.com and 
geo10.t-mobile.com incorrectly return NXDOMAIN when queried for NS 
records for epdg.epc.geo.mnc260.mcc310.pub.3gppnetwork.org and 
epc.geo.mnc260.mcc310.pub.3gppnetwork.org. Note that they correctly 
return an answer when queried for A records. See also: 
https://dnsviz.net/d/epdg.epc.mnc260.mcc310.pub.3gppnetwork.org/dnssec/

-- 
Richard
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