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A comment on Verizon Rejecting Twilio Error Message as Violating Carrier Guidelines.

Re:Verizon Rejecting Twilio Error Message as Violating Carri... by minerva23 on Wednesday December 29, 2021 @04:18PM (#29730157)
All traffic passing through Twilio is categorized as application-to-person traffic. If you haven't registered your brand, been assigned a trust score, and registered your specific number with a specific a2p campaign, you'll be subjected to heavy filtering.

I'm not positive, but I think voip.ms only allows person-to-person traffic. Try registering a number there and sending the same message that got blocked.

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Re:Verizon Rejecting Twilio Error Message as Violating Carri... by another_comment on Wednesday December 29, 2021 @04:28PM (#29730263)
>> All traffic passing through Twilio is categorized as application-to-person traffic.

Thanks, I didn't know that.

>> If you haven't registered your brand, been assigned a trust score, and registered your specific number with a specific a2p campaign, you'll be subjected to heavy filtering.

I've done none of the above. I've been using Twilio for 3 years and this is the first time I've ever had an SMS rejected. I don't get it.

>> I think voip.ms only allows person-to-person traffic. Try registering a number there and sending the same message that got blocked.

I'll give that a try.

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Re:Verizon Rejecting Twilio Error Message as Violating Carri... by jrowley on Wednesday December 29, 2021 @04:31PM (#29730291)
These are relatively new restrictions - have been rolling out since this fall. https://support.twilio.com/hc/en-us/articles/1260800720410-W...

I've found sending from toll free numbers like 1-888 reduced filtering also. Only costs like a dollar or 2 a month extra.

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Re:Verizon Rejecting Twilio Error Message as Violating Carri... by minerva23 on Wednesday December 29, 2021 @05:09PM (#29730717)
That's not just anecdotal. The carriers do process short code and toll free traffic differently from regular 10DLC. You don't even need do register an a2p campaign for them.
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