Source note · Firewall ports and IP ranges for cloud calling
Cisco states that where TLS is used as the media transport protocol by Webex apps and Cisco Video devices with a configured proxy server the media is routed through that proxy, which can create bandwidth bottlenecks and subsequent packet loss, and strongly recommends that TLS is not used to transport media in production environments.
Checked 2026-09-16
- Vendor
- Cisco
- Product
- Webex
- Subsystem
- media
- Deployment
- not restricted
- Region
- not restricted
- Release range
- not restricted
- Checked
- 2026-09-16
Sources
- Network Requirements for Webex Services — Cisco Systems, Inc. (help.webex.com) · tier 2 current vendor documentation · Proxy server bottlenecks paragraph
Cite this note
APA
WarmTransfer. (2026, September 16). Firewall ports and IP ranges for cloud calling: source note fwports-tls-media-through-a-proxy-bottlenecks. WarmTransfer. https://warmtransfer.net/knowledge/claims/fwports-tls-media-through-a-proxy-bottlenecks
BibTeX
@misc{warmtransfer-claim-fwports-tls-media-through-a-proxy-bottlenecks,
title = {Firewall ports and IP ranges for cloud calling: source note fwports-tls-media-through-a-proxy-bottlenecks},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/fwports-tls-media-through-a-proxy-bottlenecks},
note = {Source note fwports-tls-media-through-a-proxy-bottlenecks, checked 2026-09-16}
}