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A comment on Ask HN: How to mitigate “SMS layer” DDoS attacks with Twilio-style services?.

Re:Ask HN: How to mitigate “SMS layer” DDoS attacks with Twi... by posguy on Sunday May 10, 2020 @09:14PM (#23137927)
Your carrier should not be charging you for inbound SMS, changing SMS enablement providers can usually be done in a few minutes.

I would encourage you to look at Teli, Telnyx & Signalwire, iirc they all support blocking texts from a particular number. Avoid Bandwidth.com unless you want to deal with a long sales funnel and chasing them for API keys they never provide.

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Re:Ask HN: How to mitigate “SMS layer” DDoS attacks with Twi... by turkeytotal on Sunday May 10, 2020 @09:27PM (#23138009)
>Your carrier should not be charging you for inbound SMS

Agreed!

>look at Teli, Telnyx & Signalwire

Thank you, a quick glance seems to indicate they do not charge for inbound SMS on local numbers.

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Re:Ask HN: How to mitigate “SMS layer” DDoS attacks with Twi... by posguy on Sunday May 10, 2020 @09:34PM (#23138052)
Teli has treated us well for years, they use some small cell provider in the midwest for SMS/MMS enablement. Signalwire is essentially Bandwidth.com without the sales funnel.
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Re:Ask HN: How to mitigate “SMS layer” DDoS attacks with Twi... by turkeytotal on Monday May 11, 2020 @11:14AM (#23143020)
FWIW, I looked through the APIs and while I did see mechanisms for rejecting phone calls and faxes, I did not see a way to block specific numbers from sending you SMS. Not that it matters, free inbound more or less solves the problem. Thanks again.
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Re:Ask HN: How to mitigate “SMS layer” DDoS attacks with Twi... by posguy on Monday May 11, 2020 @04:32PM (#23146681)
Hrm, it looks like its a documented endpoint: https://apidocs.teleapi.net/api/my-phone-numbers/block-inbou...
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