When an administrator blocks calls that fail STIR/SHAKEN validation, Webex Calling does not offer the call to the user, releases it with cause 603 and logs it in the user's call history as blocked.
Checked 2026-09-30
The call is released with cause 603.
- Vendor
- Cisco
- Product
- Webex Calling
- Subsystem
- secure calling and spam mitigation
- Deployment
- multi-tenant
- Region
- us and canada
- Release range
- current as of 2026-09-30
- Checked
- 2026-09-30
Sources
- Secure Calling and Spam mitigation — Cisco Systems, Inc. (help.webex.com) · tier 2 current vendor documentation · Section Call disposition and reporting
Cite this note
APA
WarmTransfer. (2026, September 30). Caller authentication and fraud prevention in contact centers: source note contact-center-caller-authentication-webex-block-603. WarmTransfer. https://warmtransfer.net/knowledge/claims/contact-center-caller-authentication-webex-block-603
BibTeX
@misc{warmtransfer-claim-contact-center-caller-authentication-webex-block-603,
title = {Caller authentication and fraud prevention in contact centers: source note contact-center-caller-authentication-webex-block-603},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/contact-center-caller-authentication-webex-block-603},
note = {Source note contact-center-caller-authentication-webex-block-603, checked 2026-09-30}
}