With most voice traffic now flowing over the internet, phreaking shifted too. SIP servers and VoIP PBXs are often left exposed with default credentials or poor firewalling. Hackers abuse them to make free international calls, pivot into corporate networks, or flood lines with robocalls. Tools like SIPVicious and Asterisk dial plan tricks turned voice over IP into voice over exploits. Some attackers automate scans to find vulnerable systems within minutes of going online. Misconfigured voicemail boxes and conferencing features are also popular entry points.

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