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 received 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 provider." 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? Beckman --------------------------------------------------------------------------- Peter Beckman Internet Guy beckman at angryox.com http://www.angryox.com/ ---------------------------------------------------------------------------