[VoiceOps] T-Mobile Originated Calls - No Ringback

[Gabriel Kuri]

Considering it appears to be more of a widespread problem, any ideas on how
to get T-Mobile's attention? Anyone have any contacts or a way to escalate
to their netops or engineering team?

I thought about posting to nanog, but figured they would redirect me here.
I'm not sure nanog would be the right place?

Gabe

On Mon, Jan 31, 2022 at 12:17 PM Carlos Alvarez <caalvarez at gmail.com> wrote:

> A few people have reported this as a fault on our end.  But I've also
> heard it from friends who use T-Mobile and the complainers agree it
> sometimes happens to numbers that are not ours.  The complaints originate
> from Los Angeles, Vegas, Phoenix, and others.  So it's just more
> T-Mobile/Sprint idiocy all over.
>
>
> On Mon, Jan 31, 2022 at 12:21 PM Alex Balashov <abalashov at evaristesys.com>
> wrote:
>
>> I’ve experienced this as a T-Mobile customer in Georgia, at least calling
>> my parents locally who are on Verizon. I get +/- 1 ringback tone and then
>> dead air until they answer. I was wanting to ask the list if this is a
>> “thing” or just a peculiarity of our area.
>>
>> > On Jan 31, 2022, at 2:05 PM, Gabriel Kuri via VoiceOps <
>> voiceops at voiceops.org> wrote:
>> >
>> > I'm not sure if this has come up here before, I couldn't find anything
>> specific, but I'm seeing an issue where calls originating from T-Mobile to
>> other carriers are not generating ringback. The call is indeed ringing on
>> the other end, but on the T-Mobile phone, it's just dead air until the
>> person on the other end answers the call. It's not all calls, but it is
>> reproducible to certain phone numbers and reproducible using various
>> T-Mobile customers. It's not limited to a single phone T-Mobile
>> number/customer. Further troubleshooting has shown that calls from other
>> providers (ie AT&T, Verizon Wireless) do not have this problem to the same
>> numbers the issue can be reproduced from T-Mobile. It's only calls from
>> T-Mobile numbers to other phone numbers outside of T-Mobile so far.
>> >
>> > The no ringback issue seems to occur whether you're on wifi calling or
>> on a cell tower. All of the T-Mobile users we can reproduce the issue with
>> are in Southern California. Not sure if any of this matters.
>> >
>> > I tried to deal with customer service and opened a ticket that
>> supposedly was escalated to engineering, but of course that fell on deaf
>> ears and the response I got was basically "Can't reproduce, it's not our
>> problem" 8-/ ...
>> >
>> > Any T-Mobile engineers on this list that could help or any
>> recommendations on how to raise attention to this problem to someone at
>> T-Mobile with a clue?
>> >
>> > Gabe
>> >
>> >
>> > _______________________________________________
>> > VoiceOps mailing list
>> > VoiceOps at voiceops.org
>> > https://puck.nether.net/mailman/listinfo/voiceops
>>
>> --
>> Alex Balashov | Principal | Evariste Systems LLC
>>
>> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
>> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
>>
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