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isn-discuss - Re: [isn-discuss] anybody use ITAD

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Re: [isn-discuss] anybody use ITAD


Chronological Thread 
  • From: James Cloos <>
  • To: John Covert <>
  • Cc: ,
  • Subject: Re: [isn-discuss] anybody use ITAD
  • Date: Tue, 05 Sep 2017 13:55:33 -0400
  • Copyright: Copyright 2017 James Cloos
  • Face: iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAgMAAABinRfyAAAACVBMVEX///8ZGXBQKKnCrDQ3 AAAAJElEQVQImWNgQAAXzwQg4SKASgAlXIEEiwsSIYBEcLaAtMEAADJnB+kKcKioAAAAAElFTkSu QmCC
  • Ironport-phdr: 9a23:aO5klRODPgCUakLg8mcl6mtUPXoX/o7sNwtQ0KIMzox0Lfv/rarrMEGX3/hxlliBBdydsKMUzbKO+4nbGkU4qa6bt34DdJEeHzQksu4x2zIaPcieFEfgJ+TrZSFpVO5LVVti4m3peRMNQJW2aFLduGC94iAPERvjKwV1Ov71GonPhMiryuy+4ZPebgFLiTanfb9+MAi9oBnMuMURnYZsMLs6xAHTontPdeRWxGdoKkyWkh3h+Mq+/4Nt/jpJtf45+MFOTav1f6IjTbxFFzsmKHw65NfqtRbYUwSC4GYXX3gMnRpJBwjF6wz6Xov0vyDnuOdxxDWWMMvrRr0vRz+s87lkRwPpiCcfNj427mfXitBrjKlGpB6tvgFzz5LIbI2QMvd1Y6HTcs4ARWdZXshfSTFPDYGyb4QBAeQPPulXoJXmqlsSsReyGRWgCP/1xzNUgHL9wK000/4mEQHDxAEuG8gBsHHKo9XuKawfT+S1zK7PzTXYcvhb3ivy6IzPchAmuvGBRrBwccrNxkkrEAPFiU6QpZb5MDOS0+QAqm6W5PduW+Kojm4osQBxoj63y8cuionGmoYVylfD9SVi2oo6Odq4SEt9bNW5E5VQrzmXO5ZyT84hWW1kpSk3x78ctZKlYiQG0pcqyhzZZveaaYaH+AjjW/yUITpghHJqZra/hxGq/Ein0O3zSNO40FRKriVZltnMsXcN1wfJ5sebTft9+1+t2TeJ1w/N9uFJOV04mK7YJpI737I9mZgevV7dEiPogkn7j62bel0h+uey6uTnZrvmpoWbN49xkgzxLqAumsu4AeQjKQUOXWib9vi41L3k+k35W69GgeExkqncqJzaP9gUpralAw9J1YYu8xe/Dyyg0NgBgHYHLUlFdw6aj4jyIFHDO/T4Dfakg1Swizdn2erKPrznApXRMHfDirHhcqhh60JC0gY8081Q548HQo0GddD0Wkm5n9vGAwUle1i/xPjqEslV3YQAVHiTRKiDP/WBn0WP47cNKuyBf8c+vDH6MLBx7PrpimQRm18Wea6uxt0cb3XuTacuGFmQfXe52oRJKmwNpAdrCbWy0FA=
  • Openpgp: 0x997A9F17ED7DAEA6; url=https://jhcloos.com/public_key/0x997A9F17ED7DAEA6.asc
  • Openpgp-fingerprint: E9E9 F828 61A4 6EA9 0F2B 63E7 997A 9F17 ED7D AEA6
>>>>> "JC" == John Covert
>>>>> <>
>>>>> writes:

JC> If you firewall SIP from all but a few whitelisted addresses, then
JC> there is no point at all to ISN dialing via an ITAD number which
JC> your employees put on their business cards, is there?

The pbx firewalls. The sip proxy is in the whitelist and blocks
attacks.

For example, if you dial 8463*368 the naptr converts that to
sip:8463*
which a SRV sends to gate.jhcloos.com.

Gate looks at the INVITEd URI, recognizes
8463*
as
legitimate and passes it on to an asterisk, which reports the current
UTC time.

If you want to accept general sip calls you need to avoid the constant
attacks. Sip proxies like kamailio do a significantly better job of
that than pbxes like asterisk. If only because they are programable.

(My testing ISNs are listed at: http://jhcloos.com/sip-itad-isn/ )

-JimC
--
James Cloos
<>
OpenPGP: 0x997A9F17ED7DAEA6

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