What precautions should be taken against VoIP security threats?
First, ensure that all VoIP traffic is encrypted. There are multiple options here including VPNs and SRTP (Secure RTP), but make sure that the selected encryption method is efficient and fast. Otherwise, performance and throughput may be negatively impacted. Second, actively monitor for unauthorized or non-compliant technologies supporting the VoIP network. This includes identifying devices with non-standard configurations. Third, make VoIP servers physically secure by adopting technologies such as firewalls and intrusion detection. Be sure to use firewalls that can handle the unique attributes of VoIP traffic. Finally, require all users to login to access the VoIP network. A VoIP handset should be treated no differently than a user’s computer where network access is governed by login and password.
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