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The reason service providers can currently focus on IP phones is because that's what most telemarketers use to make millions of phone calls via autodialers, spoofing, etc. If they had to use regular landlines, the cost (and technology) would probably be prohibitive.
 

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Discussion Starter #22
^^^^
According to an article in the Toronto Star, there is another system in the works that includes landlines.

The framework does not work on landline phones, although the CRTC says telecoms are also expected to meet a Dec. 19 deadline to implement universal call-blocking. That system prevents internet, mobile and landline calls, but only those that don’t comply with the North American Numbering Plan and may not stop spam calls that come from numbers that appear legitimate.
 

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We generally don’t answer calls if we don’t recognize the caller or the number.
Once in a while we do just to see what the latest scam or sales pitch is.


Sent from my iPad using Tapatalk
 

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Discussion Starter #26
Once in a while we do just to see what the latest scam or sales pitch is.
You can also have a bit of fun with them. There have been a few times when I get a call from "Microsoft Support" claiming they have detected a problem with my computer. I run Linux. So, I'll string them along, such as when they tell me to click on the start button. I tell them I can't find the start button. They then try to tell me other ways and I keep playing dumb. Real fun! :) Also, there have been time when I just let whoever get started on their spiel and then put my phone on hold. I then watch to see how long they stay on the line. Lots of fun! :)
 

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I went through the whole spiel with the "Microsoft support" scammers once to see what they were up to. They basically had me go into the system logs and bring up a bunch of routine warnings. I then told the person I didn't believe him and hung up. I know someone who got taken for hundreds of dollars by these scammers.
@57, I took it to mean landline customers receiving the calls, not landline callers. I doubt any phone spammers use landline phones. I subscribed to VoIP(.)ms for about a year and was surprised at how easy it was to fake caller ID. I would guess that these spammers operate at the same level as VoIP(.)ms itself and can do a lot more.
 

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Discussion Starter #28
^^^^
I used to set up multiplexers that supported ISDN and it was routine to create whatever caller ID was needed. This is a useful function for many organizations. Many want all outgoing calls to display the same caller ID and number, no matter what line was used to place the call. The problem is there was no check on whether it was being done by a valid user. Perhaps something like a DNS to compare the assigned phone number to the caller ID might help.
 

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I should be fairly straightforward to assign certificates to equipment or callers and use public key encryption to perform validation. Something similar to the way web sites are validated should work. The problem seems to be that phone companies just don't care to set up similar protocols on their phone systems because they have no motivation. There doesn't appear to be a great deal of political motivation to enforce it either. The only reason phone companies would do this is if it affects them directly in negative ways. As it stands, the only people affected are their customers so nothing is done.
 

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I just had a strange number call me that was not conforming to NANP standards, I ignored it and let it go to my voice mail just like the other 4 calls I received this morning from strange and or invalid numbers, sure enough they left a voice mail, so i called and checked it, it was legit, i was at a doctor recently and the referring specialist called me, so weird their number shows up like that, thats going to be a big problem for them down the road. anyways this is why i have voice mail.
 

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This is probably caused by an incorrect configuration on a VoIP PBX.
I once had a call identified basically as Name: Number:

meaning the info was default data in the system.
 

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... so i called and checked it, it was legit, i was at a doctor recently and the referring specialist called me, so weird their number shows up like that
That's the issue with some call blockers that can block calls from "private number" or "unknown", etc. Many medical institutions do this to maintain the privacy of their patients, who may not want others in the household to know about procedures, tests, etc. Although if they leave a VM, then another person with the PIN could access the VM...

Privacy is less of an issue with almost everyone having a cell phone these days.
 

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Discussion Starter #33
^^^^
I am aware of a woman's shelter that wanted no identification at all on calls from their phone, to protect the women from being found. While they wanted nothing to appear on the display, I don't know if there's some generic display that could be used. For example, in TV shows and movies you'll often see 555 numbers, as they are ones that are never assigned to customers.
 

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Most doctors offices and hospitals use a call privacy feature that is available to them. Call display shows "Private number" for these calls. It's only available to the general public by using *67 when making each call, not as a permanent feature. Not sure if this is available to callers with VoIP.
 

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well once universal network level blocking is fully implemented the call might not reach me it may go straight to vm, so they better get their ish together and fix their ish if the doctors want patients to hear important appointments
 

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I doubt these will be blocked by the phone companies. The number is valid and is known by the telecom. It's just not revealed to the person being called. I can see how someone writing their own call blocking rules might accidentally block such calls. That's much different from some VoIP caller who is spoofing everything about the call and is unknown to the phone company.
 

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+905 is not a valid country code, so how is it a valid number? the number should have been displayed as +1 905 blablabla
 

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Discussion Starter #38
^^^^
What are you referring to? I don't see any other mention of 905 in this thread.
 

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my doctor called me from a number that did not conform to NANP standards. so it looks like network level call blocking is not fully implemented, when they implement universal network level call blocking in the future i may not receive such call it could be blocked by the network so i may not be aware i had a doctors appointment booked, not sure if the call will still go to voicemail or not terminate, those are unknowns.
 
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