The fail2ban Asterisk filter also matches Asterisk security events InvalidAccountID, ChallengeResponseFailed, InvalidPassword and FailedACL and takes the remote IP from them.

Checked 2026-09-25

Vendor
fail2ban project
Product
fail2ban asterisk filter
Subsystem
Log indicators
Deployment
on-premises
Region
not restricted
Release range
master branch as of 2026-09-25
Checked
2026-09-25

Sources

Cite this note

APA

WarmTransfer. (2026, September 25). SIP scanning and telephony denial of service: source note sip-scanning-tdos-fail2ban-security-events. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-scanning-tdos-fail2ban-security-events

BibTeX

@misc{warmtransfer-claim-sip-scanning-tdos-fail2ban-security-events,
  title  = {SIP scanning and telephony denial of service: source note sip-scanning-tdos-fail2ban-security-events},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/sip-scanning-tdos-fail2ban-security-events},
  note   = {Source note sip-scanning-tdos-fail2ban-security-events, checked 2026-09-25}
}

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