Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - TDoS Attack Mitigation

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/ios-xe/config/ios-xe-book/m_voi-cube-tdos-attack-mitigation.html

Published

2026-04-25

Updated

unknown

Accessed

2026-09-25

HTTP status

200

License

Cisco website terms of use; copyrighted; no-redistribution; short excerpts and locators only

Source notes citing this source

• When silent discard is disabled, CUBE answers untrusted SIP requests with a 4xx error response instead of dropping them; the specific 4xx code is not stated in the source as retrieved. in context
• CUBE's trusted-source check applies only to out-of-dialog SIP requests; in-dialog requests are not validated against the trusted list. in context
• When CUBE is configured for TDoS mitigation only, it does not respond to REGISTER requests and consumes them. in context
• By default (silent-discard untrusted enabled) CUBE silently drops SIP requests from untrusted sources without sending any response. in context
• The CUBE TDoS Attack Mitigation feature stops Cisco UBE from responding to out-of-dialog SIP requests that arrive from IP addresses that are not trusted. in context
• CUBE treats as trusted the addresses in the ip address trusted list, the IP addresses in dial-peer session target statements, and server group members. in context
• The show sip-ua statistics command on CUBE reports a 'Total untrusted Request Consumed' counter, and clear sip-ua statistics resets it. in context
• CUBE prints untrusted-request syslogs to the console every 60 minutes once a threshold of 1000 SIP requests is passed. in context

Cite this source record

APA

WarmTransfer. (2026, April 25). Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - TDoS Attack Mitigation. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-cube-xe176-tdos-attack-mitigation

BibTeX

@misc{warmtransfer-cisco-cube-xe176-tdos-attack-mitigation,
  title  = {Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - TDoS Attack Mitigation},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-cube-xe176-tdos-attack-mitigation},
  note   = {Cisco Systems, accessed 2026-09-25}
}