[VoiceOps] Calls coming up as spam on mobile carriers

Lou Hu lou.h at aptalaska.com
Fri Jul 8 13:29:49 EDT 2022

Here’s a list that I have found, compiled by Spectrum.

Hope this helps.


From: VoiceOps <voiceops-bounces at voiceops.org> On Behalf Of Shawn L
Sent: Friday, July 8, 2022 10:00 AM
To: VoiceOps <voiceops at voiceops.org>
Subject: [VoiceOps] Calls coming up as spam on mobile carriers

We're having a strange one at $dayjob.  When one of our customers (in this case a hospital) calls a patient back on a cell phone, the calls are coming up with SPAM? in the caller id.  It seems to be happening with both Verizon and AT&T.

We've checked the the DIDs in question have and are sending the proper caller id, checked the Neustar database, etc. and can't find anything that's missing.  These are TDM calls.  They come in over multiple TDM PRIs and leave toward an AT&T tandem on a legacy TDM trunk group, so there's really no way to do STIR/SHAKEN call attesting.

Our switch vendor (Ribbon / Genband / Nortel)  also mentioned that they've had other clients with the issue and it seems to be limited to calls placed to mobile carriers.  Another telco was able to find an AT&T portal to register the numbers as legitimate, but it only lasted for about a month before they had to do it again.

I haven't researched where at AT&T they might have entered the numbers, but that doesn't seem like a valid option for a hospital with a thousand numbers.

Just wondering if others have seen this, and if anyone knows of a way to resolve it.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/voiceops/attachments/20220708/4e4a8a01/attachment-0001.htm>

More information about the VoiceOps mailing list