Summary

A few home VoIP solutions have room for improvement when it comes to security, while others are pretty decent. Because many of the solutions use existing VoIP protocols, such as SIP and RTP, all of them will also inherit their security exposures. For example, if RTP is used with Yahoo! Messenger, Cisco hard phones, or Vonage, its security exposures will affect all products that use it. Commercial VoIP solutions, such as Vonage, have little security built into them. Items like encryption are totally absent, which may be a surprise to most customers. Furthermore, while PSTN landlines might be as vulnerable as Vonage, IP/Ethernet is a much larger attack surface given that anyone in your home or on your wireless network can listen to calls. ...

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