[Asterisk-Users] VOIP Spam

[Tom Green]

Brian,

Encrypted SIP messages can be sent using TLS. However,
I don't think it is realistic to expect everyone
calling you to have a public/private key pair.
Cryptographic solutions have been suggested for email
spams also but they have been found to be ineffective
because of scalability problems.

I looking for a spam control solution that avoids
cryptography (I prefer non-cryptographic solutions but
I am open to new ideas). 

Thanks,
Tom.
--- Brian Cuthie <brian at systemix.com> wrote:
> 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
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