Source note · Setting up CUBE for a carrier SIP trunk
By default an inbound call that fails the IP trusted list check is silently discarded rather than answered with an error.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Cisco Unified Border Element
- Subsystem
- toll-fraud prevention
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Cisco Guide to Harden Cisco Unified Border Element (CUBE) Enterprise Devices — Cisco Systems · tier 2 current vendor documentation · Toll fraud section; handling of untrusted connections
Cite this note
APA
WarmTransfer. (2026, September 25). Setting up CUBE for a carrier SIP trunk: source note cube-carrier-trunk-setup-untrusted-silent-discard. WarmTransfer. https://warmtransfer.net/knowledge/claims/cube-carrier-trunk-setup-untrusted-silent-discard
BibTeX
@misc{warmtransfer-claim-cube-carrier-trunk-setup-untrusted-silent-discard,
title = {Setting up CUBE for a carrier SIP trunk: source note cube-carrier-trunk-setup-untrusted-silent-discard},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cube-carrier-trunk-setup-untrusted-silent-discard},
note = {Source note cube-carrier-trunk-setup-untrusted-silent-discard, checked 2026-09-25}
}