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  Reply # 747444 19-Jan-2013 17:28
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And just remember that entire setup as it stands present can be exploited by anybody who really wants to make a call unless you lock things down further.






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  Reply # 747448 19-Jan-2013 17:34
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Thanks, @sbiddle for the tantalising comment. While I don't mind too much the risk of guests bypassing my (rather limited) security on the outgoing calls, I would be curious to know how to go about strengthening the security a bit, since I haven't a clue how to do it.

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  Reply # 747492 19-Jan-2013 18:52
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You need to set up a explicit rules only allowing numbers you want. Any generic rules such as X. in an outbound route introduce loopholes.




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  Reply # 747560 19-Jan-2013 22:26
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The universe of numbers that I might want to allow is so large that it would be a herculean task to do this. I'm willing to risk this security loophole for now.

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  Reply # 747586 20-Jan-2013 00:31
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sbiddle: You need to set up a explicit rules only allowing numbers you want. Any generic rules such as X. in an outbound route introduce loopholes.



Can you explain this further? As far as i understand this will just match anything with 00,04,07,09 and nothing else. How does it make it insecure? Is there something they can dial to circumvent this? Apart from blocking individual area codes what more can you do?

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