[VoiceOps] Strange inbound Calls

[Matthew Crocker]

Automated system trying to probe for auto-attendant and/or voicemail holes?

--
Matthew S. Crocker
President
Crocker Communications, Inc.
PO BOX 710
Greenfield, MA 01302-0710

E: matthew at crocker.com
P: (413) 746-2760
F: (413) 746-3704
W: http://www.crocker.com



On Oct 2, 2013, at 10:31 PM, Brandon Lehmann <brandon at bitradius.com> wrote:

> I’ll have to dig into our logs a bit closer. We’ve been seeing a bunch of 1s voicemails appear from random calling numbers to one of our TFs the last few months. I attributed it to listing the # on our ARIN and RADB entries for our ASN but haven’t had time to find the correlation.
>  
>  
>  
> From: VoiceOps [mailto:voiceops-bounces at voiceops.org] On Behalf Of Nick Olsen
> Sent: Wednesday, October 02, 2013 2:54 PM
> To: Jay Hennigan
> Cc: voiceops at voiceops.org
> Subject: Re: [VoiceOps] Strange inbound Calls
>  
> If the call is answered by a human, They hear nothing on the other side. I will ask our receptionist to allow the call to continue for a minute or so and see if it hangs up at the 60 second mark.
>  
> Timing our own IVR. It takes exactly 60 seconds, If you press nothing to get all the way 1 second in to voicemail. As these calls always appear leaving 1 second voicemails.
> 
> Nick Olsen
> Network Operations
> (855) FLSPEED  x106
> 
> <image001.jpg>
>  
> 
> From: "Jay Hennigan" <jay at west.net>
> Sent: Wednesday, October 02, 2013 2:25 PM
> To: voiceops at voiceops.org
> Subject: Re: [VoiceOps] Strange inbound Calls
> 
> On 10/2/13 10:13 AM, Nick Olsen wrote:
> > Hello Everyone,
> > 
> > We've been seeing a lot of strange inbound calls to our toll free
> > numbers recently. The only thing they have in common is the caller ID
> > text is always a city and a state. And the the call duration is 60
> > seconds on the dot..Every time.
> 
> Are the calls answered by a human? If so, what do they hear? If not
> and it's an IVR, if you call and say nothing does the call drop in 60
> seconds?
> 
> City and state are not uncommon for CNAM. Many CNAM providers will put
> the city and state of the rate center for the NPA-NXX if caller name
> isn't available.
> 
> --
> Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net
> Impulse Internet Service - http://www.impulse.net/
> Your local telephone and internet company - 805 884-6323 - WB6RDV
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