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#108234 by holmes4
Fri Mar 29, 2013 7:23 am
The "Card Services" spammers frequently use bogus and invalid numbers in their caller ID. For example, I just got a call from an 899-000-xxxx number. Both the area code and exchange are invalid. I would like to suggest that Ooma automatically blacklist such numbers (or at least allow us the option to do so.)
#108235 by murphy
Fri Mar 29, 2013 8:33 am
The 899 area code is in Mexico. It is not invalid.
#108236 by holmes4
Fri Mar 29, 2013 9:22 am
899 is not an assigned area code in the North American Numbering Plan. Mexico is not part of that - though I don't find 899 assigned as a city or area code in Mexico either. I would not expect Ooma to filter out numbers from outside the NANP. According to http://en.wikipedia.org/wiki/List_of_No ... 2.80.93899 , 899 is reserved for future expansion of the NANP.

But even so, 000 is invalid as an exchange.
#108298 by Telo_BK
Mon Apr 01, 2013 11:28 am
There is no valid local (7-digit) number that begins with 0 or 1. When you dial 0 for the first (or only) digit, it's for the operator, anything after that is ignored. Dialing 1 tells the switch that it's a long distance call, and 10 digits follow (can also be used for international with different quantities of digits afterward). I used to design lots of telecom equipment (back when a switch really was a switch). In order to maintain compatibility with newer systems, this scheme is still in place.

So, regardless of the area code, if the second set of three digits begins with 0 or 1, it's invalid from the telco's standpoint and cannot be routed to a subscriber.
#108311 by holmes4
Mon Apr 01, 2013 3:49 pm
I'm not sure their implementation will do this - see my reply in the other thread.
#108315 by lbmofo
Mon Apr 01, 2013 6:19 pm
Area codes starting with 0 or 1 are invalid numbers so 0* and 1* will block most invalid numbers.
#108338 by holmes4
Tue Apr 02, 2013 6:52 am
It's exchanges starting with 0 or 1 that Ooma's system still can't deal with. But this gets back to my original request - Ooma should allow me to automatically block country code 1 calls where the area code or exchange is invalid.

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