Source note · SIP scanning and telephony denial of service
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.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Cisco Unified Border Element (CUBE)
- Subsystem
- TDoS Attack Mitigation
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Cisco IOS XE 17.6 onwards
- Checked
- 2026-09-25
Sources
- Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - TDoS Attack Mitigation — Cisco Systems · tier 2 current vendor documentation · TDoS Attack Mitigation > feature overview
Cite this note
APA
WarmTransfer. (2026, September 25). SIP scanning and telephony denial of service: source note sip-scanning-tdos-cube-no-silent-discard-4xx. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-scanning-tdos-cube-no-silent-discard-4xx
BibTeX
@misc{warmtransfer-claim-sip-scanning-tdos-cube-no-silent-discard-4xx,
title = {SIP scanning and telephony denial of service: source note sip-scanning-tdos-cube-no-silent-discard-4xx},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-scanning-tdos-cube-no-silent-discard-4xx},
note = {Source note sip-scanning-tdos-cube-no-silent-discard-4xx, checked 2026-09-25}
}