When does Microsoft Teams use TCP? - Microsoft Q&A (2024)

Hi @Historical_Swimming ,

I tried searching a lot but it seems that currently there's no official document available explicitly stating this. Below are some potentially relevant information I found during my research for reference:

  • For Teams to function correctly, you must open TCP ports 80 and 443 from the clients to the internet, and UDP ports 3478 through 3481 from the clients to the internet. The TCP ports are used to connect to web-based content such as SharePoint Online, Exchange Online, and the Teams Chat services. Plug-ins and connectors also connect over these TCP ports. The four UDP ports are used for media such as audio and video, to ensure they flow correctly. (Evaluate my environment)
  • For all Microsoft 365 and Office 365 workloads, the recommended connection method to Teams services is bypassing the forward proxy where possible. When a proxy server sits between a client and the Office 365 data centers, media might be forced over TCP instead of UDP, which would impact media quality. (Microsoft 365 and Office 365 URLs and IP address ranges)

Besides, below is an additional article about this topic and hopefully you can find it be of some help:
UDP vs TCP, what is best for Microsoft Teams Voice?
(Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)

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When does Microsoft Teams use TCP? - Microsoft Q&A (2024)

FAQs

When does Microsoft Teams use TCP? - Microsoft Q&A? ›

The TCP ports are used to connect to web-based content such as SharePoint Online, Exchange Online, and the Teams Chat services. Plug-ins and connectors also connect over these TCP ports. The four UDP ports are used for media such as audio and video, to ensure they flow correctly.

Which protocol does Microsoft Teams use? ›

Teams uses mutual TLS (MTLS) and Server to Server (S2S) OAuth (among other protocols) for server communications within Microsoft 365 and Office 365, and also uses TLS from clients to the service. All traffic on the network is encrypted.

What is protocol used for signaling in MS teams? ›

Most signaling traffic uses the HTTPS-based REST interfaces, though in some scenarios (for example, connection between Microsoft 365 and a Session Border Controller) it uses SIP protocol.

What port does Teams use for screen sharing? ›

If your company requires tagging on destination ports, contact support to enable communication to the Transport Relay with UDP ports 3479 (Audio), 3480 (Video), and 3481 (Sharing). If you've enabled Quality of Service, you must manage your port settings.

How does Microsoft Teams track you? ›

Anytime a user engages with Teams in one-on-one, group and channel messaging, voice, video, conference meetings or file sharing, it counts toward active use for reporting purposes. Looking specifically at chat messages, all posts, replies, mentions and reactions are tabulated over a specified time frame.

Does Microsoft Teams use TCP? ›

For Teams to function correctly, you must open TCP ports 80 and 443 from the clients to the internet, and UDP ports 3478 through 3481 from the clients to the internet. The TCP ports are used to connect to web-based content such as SharePoint Online, Exchange Online, and the Teams Chat services.

Do Teams use TCP? ›

Teams can and sometimes does use TCP over UDP. In a stable network environment, you really shouldn't notice much difference between the two. The more instability that you experience on your network, you will find that UDP well outperforms using TCP.

Is Teams audio TCP or UDP? ›

As you mentioned, the audio portion of a Teams call typically uses UDP ports, 50000-50019 for the source and UDP ports 3478-3481 for the destination.

What is Signalling protocol in TCP? ›

A signaling protocol is a type of communications protocol for encapsulating the signaling between communication endpoints and switching systems to establish or terminate a connection and to identify the state of connection. The following is a list of signaling protocols: ALOHA.

Does Teams use SIP protocol? ›

Now you can sign-in to Teams with your corporate credentials and make and receive calls with a compatible SIP device. Compatible devices can be Skype for Business IP phones with standard SIP firmware, Cisco IP phones with multiplatform SIP firmware, or SIP devices from vendors such as Poly, Yealink, and AudioCodes.

What is TCP port 5228 used for? ›

Port 5228 is used by the Google Playstore (Android market). Google talk also uses ports 443, 5222 and 5228. Google Chrome user settings sync (facorites, history, passwords) uses port 5228.

What is TCP port 7680 used for? ›

TCP port 7680 is used by WUDO (Windows Update Delivery Optimization) to distribute updates in Windows LANs. Notes: Port numbers in computer networking represent communication endpoints. Ports are unsigned 16-bit integers (0-65535) that identify a specific process, or network service.

What is the difference between TCP and UDP? ›

The main difference between TCP (transmission control protocol) and UDP (user datagram protocol) is that TCP is a connection-based protocol and UDP is connectionless. While TCP is more reliable, it transfers data more slowly. UDP is less reliable but works more quickly.

Can my manager track me on Microsoft Teams? ›

As a manager, you can track almost everything your employee does within Teams. This includes text conversations, recorded calls, Zoom meetings, and more.

Can you be monitored through Microsoft Teams? ›

The short answer is that Teams meetings can be monitored, recorded, transcripts recorded, documents and chat recorded by internal people such as those included in meetings, chat, or by an employer.

Can Teams monitor employee activity? ›

You can create a dashboard in Microsoft Teams for tracking employee statuses. Create a SharePoint list in SharePoint to track employee statuses, including columns for name, status, and additional information. Set permissions to restrict access to project managers.

Is Teams SIP or VoIP? ›

Teams Calling Plans are Microsoft's default VoIP solution, the virtual phone service powering your Teams phone system. Teams Direct Routing is your SIP Trunk, allowing you to use your own chosen carriers instead of Microsoft's default service.

What version of TLS is Microsoft Teams? ›

Microsoft 365 supports TLS version 1.2 (TLS 1.2). Some of the services continue to support TLS version 1.3 (TLS 1.3). Be aware that TLS versions deprecate, and that deprecated versions should not be used where newer versions are available. If your legacy services do not require TLS 1.0 or 1.1 you should disable them.

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