Proxy servers for Teams

Publisher

Microsoft

URL

https://learn.microsoft.com/en-us/microsoftteams/proxy-servers-for-skype-for-business-online

Published

2026-05-25

Updated

unknown

Accessed

2026-10-14

HTTP status

200

License

Microsoft Learn terms of use; no-redistribution; short excerpts and locators only

Source notes citing this source

• For fixed-function UC devices, exempting UC traffic from inspection is the practical path rather than distributing the inspection CA: Microsoft does not support private CAs on Android-based Teams phones, and Cisco devices need a TAC case to add one. inferred in context
• Android-based Teams devices, including Teams phones, panels, displays and boards, don't support authenticated proxy servers or tenant restrictions, and Microsoft recommends they bypass proxy infrastructure. in context
• Microsoft states that installing privately signed certificates, such as an SSL-inspection proxy CA, on Teams phones and other Android-based Teams devices isn't supported. in context
• Microsoft recommends that Teams traffic bypass proxy server infrastructure, including SSL inspection, and suggests placing Teams Phones and Teams Rooms devices on a dedicated VLAN with direct internet access. in context
• Attendees of Teams events optimized for large audiences and of view-only meetings receive the stream over TCP HTTPS, and Microsoft recommends bypassing proxies and disabling SSL inspection for *.ml.cdn.office.net, *.ml.teams.microsoft.com, *.ml.communications.svc.cloud.microsoft and *.ml.communications.svc.static.microsoft in the commercial cloud. in context
• Microsoft states that Teams media traffic is already encrypted, so passing it through a proxy server does not make it more secure, and proxies can add latency and packet loss. in context
• Microsoft states that if the proxy uses a privately signed certificate for SSL inspection, the certificate and its chain must be installed on the Teams meeting room device so the device trusts it. in context
• 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. in context
• Windows-based Teams meeting rooms and Surface Hubs support some proxy servers but don't support proxy servers that require authentication. in context

Cite this source record

APA

WarmTransfer. (2026, May 25). Proxy servers for Teams. WarmTransfer. https://warmtransfer.net/knowledge/sources/ms-learn-teams-proxy-servers

BibTeX

@misc{warmtransfer-ms-learn-teams-proxy-servers,
  title  = {Proxy servers for Teams},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/ms-learn-teams-proxy-servers},
  note   = {Microsoft, accessed 2026-10-14}
}