Source note · Web proxies and TLS inspection that break UC clients
Teams uses long-lived WebSocket connections for chat updates, call notifications and signaling, and presence; if WebSockets can't be established it falls back to HTTP long polling, which increases bandwidth and latency.
Checked 2026-10-14
- Vendor
- Microsoft
- Product
- Microsoft Teams
- Subsystem
- signaling
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-10-14
- Checked
- 2026-10-14
Sources
- Prepare your organization's network for Microsoft Teams — Microsoft (Microsoft Learn) · tier 2 current vendor documentation · Network optimization table > Allow WebSocket protocol
Cite this note
APA
WarmTransfer. (2026, October 14). Web proxies and TLS inspection that break UC clients: source note tls-inspection-uc-clients-teams-websocket-fallback. WarmTransfer. https://warmtransfer.net/knowledge/claims/tls-inspection-uc-clients-teams-websocket-fallback
BibTeX
@misc{warmtransfer-claim-tls-inspection-uc-clients-teams-websocket-fallback,
title = {Web proxies and TLS inspection that break UC clients: source note tls-inspection-uc-clients-teams-websocket-fallback},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/tls-inspection-uc-clients-teams-websocket-fallback},
note = {Source note tls-inspection-uc-clients-teams-websocket-fallback, checked 2026-10-14}
}