Source note · Web proxies and TLS inspection that break UC clients
For Webex Calling behind a TLS-inspecting proxy, Cisco multiplatform (MPP) IP phones, like Webex Room devices, need a TAC service request to install the proxy's CA certificate.
Checked 2026-10-14
- Vendor
- Cisco
- Product
- Cisco MPP IP Phones
- Subsystem
- proxy and inspection
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-10-14
- Checked
- 2026-10-14
Sources
- Port Reference Information for Webex Calling — Cisco Systems, Inc. (help.webex.com) · tier 2 current vendor documentation · Proxy support > TLS inspection / certificate trust subsection
Cite this note
APA
WarmTransfer. (2026, October 14). Web proxies and TLS inspection that break UC clients: source note tls-inspection-uc-clients-wxc-mpp-ca-via-tac. WarmTransfer. https://warmtransfer.net/knowledge/claims/tls-inspection-uc-clients-wxc-mpp-ca-via-tac
BibTeX
@misc{warmtransfer-claim-tls-inspection-uc-clients-wxc-mpp-ca-via-tac,
title = {Web proxies and TLS inspection that break UC clients: source note tls-inspection-uc-clients-wxc-mpp-ca-via-tac},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/tls-inspection-uc-clients-wxc-mpp-ca-via-tac},
note = {Source note tls-inspection-uc-clients-wxc-mpp-ca-via-tac, checked 2026-10-14}
}