Forced Call Teardown

• Vulnerabilities:

• • Most protocols are unencrypted and do not authenticate all packets
  • The signaling channel can be monitored

• Attack:

• • Inject spoofed call tear-down messages into the signaling channel such as:
  • • SIP: BYE
    • IAX: HANGUP (Frame type 0x06, Subclass 0x05)

• Effect:

• • DoS: A call in progress is forcibly closed.