Forum Discussion
SFB UDP Ports
Hi Will,
The ports you mentioned are used for the realtime communication part (e.g. Audio, Video, Sharing) of SfB and Teams. So you should definitly use/allow them. If you don't open them, there is a fallback used via Port 443/TCP. This is the mode your environment currently running in.
These ports fall in the category of optimize. You can find the recommendations for this kind of traffic here:
https://docs.microsoft.com/en-us/office365/enterprise/office-365-network-connectivity-principles?redirectSourcePath=%252fen-us%252farticle%252foffice-365-network-connectivity-principles-76e7f232-917a-4b13-8fe2-4f8dbccfe041#new-office-365-endpoint-categories
If you are planning a change with the network Team I would recommend the Network Testing Companion. This allows you to simulate calls and test network connectivity for these ports.
You can find a blog article from Erwin Bierens how to install this here: https://erwinbierens.com/skype-for-business-and-microsoft-teams-network-testing/
Regards,
Paul
Paul Lange I found it! :) Thanks! I've managed to run a test and got the attached result.
May I know what are the advantages and disadvantages of allowing these ports?
Forgive me for being inexperience :)
Thanks!
Will
Allowing these ports will allow Teams and SfB to use UDP instead of TCP for transmitting realtime traffic (e.g. Audio/Video).
UDP can deliver packets faster to the far end than TCP (avoiding error checks) and performs better in problematic network conditions. This is the reason why in the Unified Communication space UDP is prefered over TCP for the audio and video part.
Hope this helps.
Paul