Source note · Web proxies and TLS inspection that break UC clients
Where Teams traffic must traverse a proxy, Microsoft recommends direct UDP-based routing for media rather than TCP, and allowing UDP 3478-3481 for Teams media through the firewall.
Checked 2026-10-14
- Vendor
- Microsoft
- Product
- Microsoft Teams
- Subsystem
- media
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-10-14
- Checked
- 2026-10-14
Sources
- Proxy servers for Teams — Microsoft · tier 2 current vendor documentation · If you need to use a proxy server > Microsoft also strongly recommends, bullets 3-4
Cite this note
APA
WarmTransfer. (2026, October 14). Web proxies and TLS inspection that break UC clients: source note tls-inspection-uc-clients-teams-udp-media-ports. WarmTransfer. https://warmtransfer.net/knowledge/claims/tls-inspection-uc-clients-teams-udp-media-ports
BibTeX
@misc{warmtransfer-claim-tls-inspection-uc-clients-teams-udp-media-ports,
title = {Web proxies and TLS inspection that break UC clients: source note tls-inspection-uc-clients-teams-udp-media-ports},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/tls-inspection-uc-clients-teams-udp-media-ports},
note = {Source note tls-inspection-uc-clients-teams-udp-media-ports, checked 2026-10-14}
}