[Asterisk-Users] Validating a phone number
I'm concerned about people dialing out of our asterisk server to numbers they shouldn't be dialing. Is there a concrete algorithm for determining whether a phone number is normal. i.e. calling this phone number would result in a normal long distance rate. It seems like the pattern 1NXXNXX for the U.S. is fairly commonly used, but it wouldn't catch erroneous phone numbers such as 1411XXX (and the other X11 numbers) Is it just a matter of checking for these invalid area codes? If so, is there a list anywhere that I could check against? I tried googling this topic, but it's hard to find anything with such common keywords. If anyone can direct me to a good resource, I'd appreciate it as well. On athe same topic, I'm worried about area codes like 809. Are there any other such area codes that should be avoided? Thanks, Peter Hsu ___ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Validating a phone number
On Sun, 2005-07-17 at 00:01 -0700, Peter Hsu wrote: I'm concerned about people dialing out of our asterisk server to numbers they shouldn't be dialing. Is there a concrete algorithm for determining whether a phone number is normal. i.e. calling this phone number would result in a normal long distance rate. It seems like the pattern 1NXXNXX for the U.S. is fairly commonly used, but it wouldn't catch erroneous phone numbers such as 1411XXX (and the other X11 numbers) normally those dont work with a 1 before them, but I cant say that is a guarantee with all providers. 19xx is normally premium service and has a sometimes steep charge. 1700xxx is another number that normally places a higher than normal charge to callers for calling. In america there are some numbers that appear normal but are premium service numbers, there are some in NJ that charge $5 to call in the 201 area code but they can exist in other states as well. You may want to filter numbers that would fit the 1NXX... format but arent in the US or Canada either. There was a company that had a number )I forget where somewhere in the caribean) that was part of the NANPA (ie 1NXX) but charged $2511/minute to callers. Because they are not in the US the FTC rules about declaring that it is a premium service number and the charges when first called do not apply. There are only a couple area codes 809 seems to come to mind but I cant guarantee that. In short you might investigate a phone company service blocker for premium service numbers and try your best to block what you can but it would be impossible for someone without SS7 network access to see what the rate of the call is since these numbers can hide virtually anywhere. I tried googling this topic, but it's hard to find anything with such common keywords. If anyone can direct me to a good resource, I'd appreciate it as well. NANPA manages all the numbers in the north american numbering plan, if memory serves their page is nanpa.org and they used to have rate center information available on their page for free that you can download (and you would need to parse it and continually get updates as new exchanges are allocated). On athe same topic, I'm worried about area codes like 809. Are there any other such area codes that should be avoided? Ahh glad you brought that up, see above. I think there are a couple of them, but I dont know off hand what they are.. try googling 'toll fraud 809' and see if that works. -- Trixter http://www.0xdecafbad.com Bret McDanel UK +44 870 340 4605 Germany +49 801 777 555 3402 US +1 360 207 0479 or +1 516 687 5200 FreeWorldDialup: 635378 signature.asc Description: This is a digitally signed message part ___ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Validating a phone number
I think the address is http://nanpa.com/ nanpa.org is photography site :) On 7/17/05, trixter http://www.0xdecafbad.com [EMAIL PROTECTED] wrote: NANPA manages all the numbers in the north american numbering plan, ifmemory serves their page is nanpa.org and they used to have rate centerinformation available on their page for free that you can download (andyou would need to parse it and continually get updates as new exchanges are allocated). ___ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Validating a phone number
On Sun, Jul 17, 2005 at 12:15:06AM -0700, trixter http://www.0xdecafbad.com wrote: In short you might investigate a phone company service blocker for premium service numbers and try your best to block what you can but it would be impossible for someone without SS7 network access to see what the rate of the call is since these numbers can hide virtually anywhere. The cost of a call is not available from any SS7 service that I know of. NANPA manages all the numbers in the north american numbering plan, if memory serves their page is nanpa.org and they used to have rate center information available on their page for free that you can download (and you would need to parse it and continually get updates as new exchanges are allocated). http://www.nanpa.com/area_codes/index.html You'll have to make a white list. On athe same topic, I'm worried about area codes like 809. Are there any other such area codes that should be avoided? Ahh glad you brought that up, see above. I think there are a couple of them, but I dont know off hand what they are.. try googling 'toll fraud 809' and see if that works. 809 is a valid area code. Read this: http://www.lincmad.com/telesleaze.html ___ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
