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Intermittent issues with inbound SMS to Telnyx (alien.top)

submitted 11 months ago by Bardic_Forge@alien.top to c/voip@netheads.online

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Has anyone noticed issues with multipart messages to Telnyx? Even purely text based messages are having issues when they are more than 160 characters so they have to be sent as multipart. Anything under 160 is pretty solid.

It's not even that they all fail. Some 250 character messages arrive. Sometimes I will send it once and the text fails, I wait a few minutes and send the same text and it succeeds. The texts all show as sent from the carrier, and don't show up in the Telnyx logs at all.

It's also a very consistent issue to reproduce. We have tried from AT&T, Verizon, T-Mobile, and Twilio. Send a few large texts and 20-70 percent will fail to arrive.

Just wanted to see if others are seeing this, because I assume it is across all of Telnyx.

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[–] grobnet@alien.top 1 points 11 months ago (1 children)

Do you have MMS delivery?

[–] Bardic_Forge@alien.top 1 points 11 months ago (1 children)

MMS is coming through fine from what we have seen. Various customers receive images to their Telnyx numbers and haven't complained about that. Just larger SMS messages.

Also, when I look at the logs from my cell phone it shows the tests all being sent as Text Message for the usage type. I don't know if AT&T converts really large texts to MMS to help with the transfer, but it doesn't look like they do for 2-3 part messages.

[–] nbeaster@alien.top 1 points 11 months ago (1 children)

I have been doing a significant amount of inbound testing with and have not noticed an issue. Its just related to something i am working on.

[–] Bardic_Forge@alien.top 1 points 11 months ago

After more checking, all of the AT&T texts that were 770 characters and above succeeded. When I check the Telnyx logs it shows that they converted to MMS and arrived correctly. Texts 760 and below failed intermittently.

Texts from Twilio didn't convert to MMS. I assume it is the app that chooses when to convert and I was using Twilio from a 3CX PBX. My tests from Twilio were successful for a 950 character text, and a 1000 character text, which were 7 parts each, but were 50/50 success/fail between 600 and 850 characters.

I don't have personal access to phones from T-Mobile and Verizon so I can't do the more extensive tests from those, just what my co-worker has tried so far and reports from our customers that various larger texts fail at random.