STIR/SHAKEN isn't implemented at all in TDM world. I've had problems on and off for years where a carrier will take SS7 traffic, send it over some janky arrangement that strips the GenericAddress parameter (where your actual destination number is hidden in the IAM - when you dip in SS7 you send the LRN as your CallingPartyNumber, set the flag indicating the call is dipped, and put the original TN in the GenericAddressParameter field) and then I get a pile of calls from specific carriers rocking into my LRN until I can get one of them to call their carrier and report the issue, which fixes it. Our usual trick is the LRNs are routed to the NOC, so they have a procedure where if they start getting calls from all over the place looking for our customers, that they ask the caller to reach out to their phone company and have them write down a little spiel to put in their trouble ticket with their carrier ("Clear Rate says they are getting the calls without the generic address parameter, which is related to failure of local number portability in your switch or tandem provider" or something to that effect), which is typically pretty effective. How often? Happens probably once a year since I set up the network in 2007 we'll have a spate of them for a day. -Paul On 7/1/21 11:42 AM, Mary Lou Carey wrote:
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,
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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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