Source note · Expressway business-to-business calling
Field reports describe internet bots sending SIP INVITE and OPTIONS to Expressway-E at around 2 to 3 per second, trying varied called patterns to find a PSTN route and spoofing the organisation's own domain or the Expressway IP as caller.
field report · Checked 2026-09-25
- Vendor
- Cisco
- Product
- Cisco Expressway
- Subsystem
- security
- Deployment
- on-premises
- Region
- not restricted
- Release range
- unspecified
- Status
- field report
- Checked
- 2026-09-25
Sources
- Securing Expressway Deployment from Spam & Toll Fraud Calls — LookingPoint · tier 5 independent technical research · Observed attack patterns section
Cite this note
APA
WarmTransfer. (2026, September 25). Expressway business-to-business calling: source note expressway-b2b-calling-field-bot-scanning. WarmTransfer. https://warmtransfer.net/knowledge/claims/expressway-b2b-calling-field-bot-scanning
BibTeX
@misc{warmtransfer-claim-expressway-b2b-calling-field-bot-scanning,
title = {Expressway business-to-business calling: source note expressway-b2b-calling-field-bot-scanning},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/expressway-b2b-calling-field-bot-scanning},
note = {Source note expressway-b2b-calling-field-bot-scanning, checked 2026-09-25}
}