Incoming calls from 1001?

**will** · 03-02-2013 10:34 AM

I was quite unpleasantly awakened at around 3 AM this morning by two calls in rapid succession that rang on line 2 only (both lines have the same number). They showed up on the caller ID as "1001" for both the name and phone number. Nobody was on the line when I answered, and neither call shows up in my call history. I've submitted a ticket regarding this matter and thought I'd see if other customers have experienced anything like this.

**ymhee_bcex** · 03-11-2013 11:52 PM

the calls don't come through your Voipo account. You can search for SIP scanners, or read a decent discussion here. The post deals with how to thwart them as well; however, unless you have unlocked (BYOD) device, you can't change SIP port or incoming dial plan (I don't know if such thing even exists on Grandstreams).

I would think that Voipo can set up the adapter to reject all calls that don't come from Voipo servers...

**GreenLantern** · 03-17-2013 09:52 PM

I hate to say it, but it is probably just a matter of time before we all start getting anonymous Viagra calls.

I believe there is a way to disable inbound calls from non-registered sources or something. Just not sure if all devices have that capability.

**ThorsDad** · 03-18-2013 08:32 PM

I just started getting calls on line 2. Caller ID says 1000 for both name and number. The calls were coming non-stop until I received a real call on line 1. Does anyone know what is causing this and how to keep it from happening again?

**tritch** · 03-18-2013 09:34 PM

These unwanted calls are typically caused by someone probing/scanning your ATA.....most likely coming from a China IP address. They are not coming from Voipo.

Here's a few suggestions:

1) The best thing to do is open up a support ticket with Voipo and have them change your SIP ports to something other than 5060 or 5061 (e.g. 5078 or 5079). This will usually stop the probing.
2) If you have a Linksys ATA, ask support if they will enable the "Restrict Source IP" setting in the ATA. Other ATA brands (Grandstream, etc) may or may not have a similar setting. This will absolutely stop the probing. In layman's terms, this basically tells the ATA to drop all data packets from any untrusted IP source and to only accept data packets from Voipo's SIP server.
3) Lastly, tighten up your router's firewall if you can. They are getting through your open ports in your router's firewall to the ATA, so removing any DMZ or port forwarding to your ATA may eliminate the issue. Hopefully you can do so without affecting calls to/from your ATA.

Hope this helps.........

**Thomas** · 03-20-2013 07:35 PM

Just reporting the same occurance happend to me at midnight last night - incoming call from 1001 followed by rapid rings. Extremly annoying.

My ATA was in a DMZ, but I just changed that and hopefully that will take care of this.

I do have an Obi that I used in the past for Google Voice. If I were to use this as my Voipo ATA would I loose any of the Voipo features?

**ThorsDad** · 03-20-2013 08:23 PM

So far it's just been the one time for me. It was frustrating because I couldn't make it stop except by unplugging the phone and I was expecting a call. My ATA is in a DMZ because it was easier than forwarding all the required ports.