[VoiceOps] Empty Calls

Sun Dec 11 18:18:48 EST 2022

Now, calls that don't answer our IVR prompts get shunted to voicemail. We get a couple dozen blank voicemail recordings a day. I'm not sure if there's any audio stream present or not because they're coming in our TDM trunks and I'm a data guy. Not sure how to figure that out in Metaswitch SAS. 

Clearing the calls if they're silent sounds interesting. I'll look to see if we can do that. 

There's no carrier that's obvious. All over the country. Some are mobile caller IDs, some are not. Given that some are mobile, I'm assuming they're illegitimate calls because why would a bunch of random cell phones across the country be calling my 7-town ISP at all hours of the day and night? They wouldn't, so it's someone spoofing them. However, there's no one there, so what are they trying to scam me out of? 

----- 
Mike Hammett 
Intelligent Computing Solutions 
http://www.ics-il.com 

Midwest Internet Exchange 
http://www.midwest-ix.com 

----- Original Message -----

From: "Richard Jobson via VoiceOps" <voiceops at voiceops.org> 
To: "Carlos Alvarez" <caalvarez at gmail.com>, "VoiceOps" <voiceops at voiceops.org> 
Sent: Sunday, December 11, 2022 2:26:23 PM 
Subject: Re: [VoiceOps] Empty Calls 

Hi Mike, 

When you have “empty” calls, do you still get some RTP? 
Have you tried recording any audio? 
Would setting the SBC to clear the call when silence detected, with a variable timer? 
Do they come from any particular carrier? 
Or NPA-NXX or IP address weighted? 

Sounds a nice Big data analysis challenge  

Many Thanks & Best Regards, 

For your convenience, please click here to schedule a time for us to talk. 

Richard Jobson 
Teraquant Corporation 
ph: 719 488 1003 
d/l: (719) 766-8523 
www.teraquant.com 
richard at teraquant.com 
https://www.linkedin.com/in/uc-expert-monitoring/ 

Network Monitoring and Service Assurance - Speech Quality Experts (PESQ/POLQA) and Active Testing - Reporting – HPBX - Session Border Controllers – SASE and SD-WAN - Big Data Analytics, fraud detection and protection. 

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From: VoiceOps <voiceops-bounces at voiceops.org> on behalf of Carlos Alvarez via VoiceOps <voiceops at voiceops.org> 
Reply-To: Carlos Alvarez <caalvarez at gmail.com> 
Date: Sunday, December 11, 2022 at 1:13 PM 
To: VoiceOps <voiceops at voiceops.org> 
Subject: Re: [VoiceOps] Empty Calls 

Are they coming in via your carrier(s), or are they coming from random IPs? 

On Dec 11, 2022 at 1:09:28 PM, Mike Hammett via VoiceOps < voiceops at voiceops.org > wrote: 

Didn't even realize I had sent it already... 

We've been getting "empty" calls for years. BY empty, I mean there's no audio there at all. They're calls from all over the place (I don't think I've traced them all down). We've had them sit on the line for hours (back when our IVR permitted that). 

Okay, I'll just deal with it. Now they're hitting our customers too. 

To me, it's more annoying than active scam calls because there's doubt if it's real or not. I assume every call not from a current or prospective customer is a scam, so from the content, it's easy to tell. 

How are others handling these calls? 

----- 
Mike Hammett 
Intelligent Computing Solutions 
http://www.ics-il.com 

Midwest Internet Exchange 
http://www.midwest-ix.com 

From: "Mike Hammett" < voiceops at ics-il.net > 
To: "Voiceops.org" < voiceops at voiceops.org > 
Sent: Sunday, December 11, 2022 2:07:02 PM 
Subject: Empty Calls 

We've been getting "empty" calls for years. BY empty, I mean there's no audio there at all. 

----- 
Mike Hammett 
Intelligent Computing Solutions 
http://www.ics-il.com 

Midwest Internet Exchange 
http://www.midwest-ix.com 

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