Source note · Web proxies and TLS inspection that break UC clients
In Webex Calling, only HTTP and HTTPS signaling goes to the proxy; SIP registration by clients and the associated SRTP-over-UDP media are not sent to the proxy and flow directly to the firewall.
Checked 2026-10-14
Clients that use SIP to register to the Webex Calling service and the associated media aren't sent to the proxy.
- Vendor
- Cisco
- Product
- Webex Calling
- 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 section
Cite this note
APA
WarmTransfer. (2026, October 14). Web proxies and TLS inspection that break UC clients: source note tls-inspection-uc-clients-wxc-sip-media-skip-proxy. WarmTransfer. https://warmtransfer.net/knowledge/claims/tls-inspection-uc-clients-wxc-sip-media-skip-proxy
BibTeX
@misc{warmtransfer-claim-tls-inspection-uc-clients-wxc-sip-media-skip-proxy,
title = {Web proxies and TLS inspection that break UC clients: source note tls-inspection-uc-clients-wxc-sip-media-skip-proxy},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/tls-inspection-uc-clients-wxc-sip-media-skip-proxy},
note = {Source note tls-inspection-uc-clients-wxc-sip-media-skip-proxy, checked 2026-10-14}
}