Forced Call Teardown

• Tools:

• • Teardown - SIP BYE injector
  • • http://www.hackingexposedvoip.com/tools/teardown.tar.gz
  • sip-kill - Injects valid SIP messages such as BYE into an existing session
  • • http://skora.net/uploads/media/sip-kill
  • sip-proxykill - Similar technique against SIP proxies
  • • http://skora.net/uploads/media/sip-proxykill

• Mitigation:

• • Encrypt the signaling channel
  • Authenticate every signaling message