[Asterisk-Users] VOIP Spam

[Brian Cuthie]

Tom Green wrote:

>Hi,
>
>Some people have suggested maintaining black lists and
>white lists to avoid spammers and allow legitimate
>callers into the network. However, the problem with
>this method is that the spammer's IP address might
>change due to DHCP. Today a spammer might get
>aaa.bbb.ccc.ddd and lets say that I put this address
>in my blacklist. To my annoyance, tomorrow a
>legitimate caller might get aaa.bbb.ccc.ddd and the
>spammer might get a different IP address. In the end,
>I end up blocking the legitimate caller also. Any
>ideas or thoughts to on this problem is appreciated.
>
>Thanks,
>Tom
>
>
>	
>		
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Yeah, for a relatively modern protocol SIP has some surprisingly glaring 
omissions, such as:

-  certificate based authentication
-  encryption
-  NAT-awareness

-brian