[VoiceOps] Issues to T-Mobile

[Pinchas Neiman]

I had some termination issues with random cell phone carriers, some where
608d other where 200d but really the phone didn't ring. (a rate of 60% of
calls was like this)

After collecting a few samples, and complaining to my upstream carrier,
they had been improved immediately)

On Wed, Jan 11, 2023 at 2:12 PM Calvin E. via VoiceOps <
voiceops at voiceops.org> wrote:

> Check the 608 responses for a Call-Info header. If present, it should
> contain a point of contact for redress.
>
> https://www.rfc-editor.org/rfc/rfc8688.html#section-3.1-3
> "If there is a Call-Info header field, it MUST have the "purpose"
> parameter of "jwscard". The value of the Call-Info header field MUST refer
> to a valid JSON Web Signature (JWS) [RFC7515
> <https://www.rfc-editor.org/rfc/rfc8688.html#RFC7515>] encoding of a jCard
> <https://www.rfc-editor.org/rfc/rfc8688.html#RFC7095> [RFC7095
> <https://www.rfc-editor.org/rfc/rfc8688.html#RFC7095>] object. The
> following section describes the construction of the JWS.¶
> <https://www.rfc-editor.org/rfc/rfc8688.html#section-3.1-3>
>
> You can also look into registering your calling numbers at sites like the
> two below. It may also help to cover the basics like CNAM and a Directory
> Listing to improve the "legitimacy" of the numbers.
>
> https://registeredcaller.com/
>
> https://www.freecallerregistry.com/fcr/
>
> Some analytics will assume the worst until proven otherwise. You could
> attempt a low volume, low velocity, high ASR test pattern on an affected
> carrier to ensure your calling numbers have some positive reputation
> established before any mass calling.
>
>
> On Wed, Jan 11, 2023 at 7:08 AM Dovid Bender via VoiceOps <
> voiceops at voiceops.org> wrote:
>
>> Hi All,
>>
>> We are a small ITSP and every so often we have issues with calls that go
>> to T-Mobile. We sign all our calls with our cert. Lately we have been
>> getting 404's, 608's etc through 382, Telnyx and SIPRoutes. Bandwidth has
>> been worse than the rest as they don't outright reject calls but they send
>> a 100 trying and leave us hanging for 30 seconds. Peerless and one other
>> carrier are completing the calls. Anyone know what makes T-Moble special
>> that so many carriers will just 404 calls to their network?
>>
>> TIA.
>>
>> Dovid
>>
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>>
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-- 
*Pinchas S. Neiman*
Software Engineer At ESEQ Technology Corp.
845.213.1229 #2
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