[VoiceOps] Calls coming up as spam on mobile carriers

Mark Wiater mark.wiater at greybeam.com
Fri Jul 8 13:15:18 EDT 2022

I forget who AT&T uses but HIYA, First Orion and TNS offer mechanisms to 

On 7/8/2022 1:00 PM, Shawn L wrote:
> 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.
> thanks
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