Source note · SIP scanning and telephony denial of service
By default a Webex Calling Local Gateway blocks incoming VoIP messages from untrusted sources, so the administrator must add allowed subnets explicitly.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Webex Calling Local Gateway (IOS XE)
- Subsystem
- Toll fraud prevention
- Deployment
- hybrid
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Configure Local Gateway on Cisco IOS XE for Webex Calling — Cisco Systems, Inc. (Webex Help Center) · tier 2 current vendor documentation · Toll Fraud Prevention section
Cite this note
APA
WarmTransfer. (2026, September 25). SIP scanning and telephony denial of service: source note sip-scanning-tdos-lgw-blocks-untrusted. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-scanning-tdos-lgw-blocks-untrusted
BibTeX
@misc{warmtransfer-claim-sip-scanning-tdos-lgw-blocks-untrusted,
title = {SIP scanning and telephony denial of service: source note sip-scanning-tdos-lgw-blocks-untrusted},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-scanning-tdos-lgw-blocks-untrusted},
note = {Source note sip-scanning-tdos-lgw-blocks-untrusted, checked 2026-09-25}
}