Source note · Setting up a Bandwidth SIP trunk
By default CUBE silently discards an inbound call that fails the IP trusted list check; no silent-discard untrusted makes it return an error instead, which Cisco cautions can reveal that the device listens for SIP.
Checked 2026-09-30
- Vendor
- Cisco
- Product
- Cisco Unified Border Element (CUBE)
- Subsystem
- toll-fraud prevention
- Deployment
- on-premises, virtual
- Region
- not restricted
- Release range
- IOS XE; source dated 2023-04-10
- Checked
- 2026-09-30
Sources
- Cisco Guide to Harden Cisco Unified Border Element (CUBE) Enterprise Devices — Cisco Systems · tier 2 current vendor documentation · Toll-fraud prevention, silent-discard untrusted
Cite this note
APA
WarmTransfer. (2026, September 30). Setting up a Bandwidth SIP trunk: source note bandwidth-sip-trunk-setup-cube-silent-discard. WarmTransfer. https://warmtransfer.net/knowledge/claims/bandwidth-sip-trunk-setup-cube-silent-discard
BibTeX
@misc{warmtransfer-claim-bandwidth-sip-trunk-setup-cube-silent-discard,
title = {Setting up a Bandwidth SIP trunk: source note bandwidth-sip-trunk-setup-cube-silent-discard},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/bandwidth-sip-trunk-setup-cube-silent-discard},
note = {Source note bandwidth-sip-trunk-setup-cube-silent-discard, checked 2026-09-30}
}