[VoiceOps] TMobile Sending Calls to LRN not Called Number

[Mark Timm]

Those are exactly my thoughts but legitimate customers are being caught up in it.


MARK TIMM
Switch Engineer
515-830-0478
-----Original Message-----
From: Mary Lou Carey <marylou at backuptelecom.com> 
Sent: Thursday, July 1, 2021 10:42 AM
To: Mark Timm <Mark.Timm at aureon.com>
Cc: voiceops at voiceops.org
Subject: Re: [VoiceOps] TMobile Sending Calls to LRN not Called Number

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I'm not an expert in how STIR/SHAKEN is implemented in the TDM world, but I've never heard of this happening until recently. I've heard anything sent over the SS7 network has issues with the token being dropped. Maybe the problem is bigger than just the token being dropped.....maybe what they are doing is causing the called number to be dropped as well! That's the only reason I can come up with as to why one would get the LRN but not the called number.

Just a thought,

MARY LOU CAREY
BackUP Telecom Consulting
Office: 615-791-9969
Cell: 615-796-1111

On 2021-07-01 10:15 AM, Mark Timm wrote:
> It’s not just T-Mobile, it’s Verizon, US Cell and Lumen originations.  
> I believe it is traffic that Inteliquent back hauls.
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> From: VoiceOps <voiceops-bounces at voiceops.org> On Behalf Of Matthew 
> Sutton
> Sent: Thursday, July 1, 2021 10:08 AM
> To: voiceops at voiceops.org
> Subject: [VoiceOps] TMobile Sending Calls to LRN not Called Number
>
> Anyone else seeing calls from TMobile coming in with the LRN as the 
> called number? The ISUP doesn't show the actual called number so we 
> can't route the calls.
>
> -Matthew
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