[VoiceOps] Troubleshooting SMS Delivery

Peter Beckman beckman at angryox.com
Mon Sep 21 18:37:56 EDT 2015

I'm having trouble with a very specific SMS deliverability issue.

I've built a little system that tests all of my DIDs to ensure SMS
deliverability and measure round-trip time.

    1. I have 3 DIDs from Carrier A; LRN says Bandwidth.com. Used as Test
        Source DIDs.
    2. I have 20-30 DIDs from Carrier B: that do not receive SMS messages
        sent from #1 DIDs; These DIDs LRN says Bandwidth.com. Used as Test
        Destination DIDs.
    3. SMS messages sent from Carrier A DID to Carrier B DID are never

Bandwidth won't talk to me about this issue because the DIDs involved are
not in my account. Frustrating, but understandable.

The question that I can't seem to get either direct carrier to answer is
who is in the middle. Carrier A reported:

     "Our SMS carrier investigated the SMS delivery issue to the numbers you
      reported and confirmed that they are routing the messages correctly
      but these are intentionally not being delivered to the TN's
      (Terminating Numbers) by the terminating carriers. They say that if
      any of these receiving parties are stating that they should be
      receiving any messages, they will need to reach out to their

Well, _I_ am the receiving party, and despite tickets open with both
carriers for 3 weeks, I'm getting no where. Carrier A won't tell me what
carrier is "intentionally not" delivering SMS messages.

Anyone on list have any insight?

Peter Beckman                                                  Internet Guy
beckman at angryox.com                                 http://www.angryox.com/

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