SOLVED

QoS Port Range

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Occasional Contributor

Hello,

 

My company is currently working on migrating from SfB to Teams and we want

our Teams to deliver quality in terms of Calls, Video and App/Screen-Sharing. 

 

In order to do so we want to enable QoS for Microsoft Teams, but we can't seem

to agree on the port range to open up to set this up and we hear 2 sides to QoS.

 

One side says we need to open a lot of ports in orde provide QoS seemlessly, another

side says the port range doesn't need to be that big for a large amount of users.

 

Hopefully you guys can help me clarify this! Our situation:

- Company with around 7.5k employees

- We call/meet/share a lot in these Covid times

 

One side says: You need to open following ports E2E for QoS:

- Audio: 42501 - 50000

- Video: 50001 - 57500

- Screenshare: 57501 - 65000

 

The other side counters this with (E2E):

- Audio: 50000 - 50499

- Video: 50500 - 50999

- Screenshare: 51000 - 51499

 

Who is at the right end here? Does a port get reserved when someone is using it and someone

else can't use it then or can multiple users use the same port for audio or video or screenshare?

 

Big thanks in advance!

 

3 Replies
Hi @Aerton,

See here

https://docs.microsoft.com/en-us/microsoftteams/qos-in-teams#choose-initial-port-ranges-for-each-med...

This will have the recommended initial port ranges. I haven't personally seen any documentation out there that references using anything below the 50,000 port range.

Hope that helps to answer your question!

Best, Chris

@Christopher Hoard 

I want to know specifically:

- Do we need to open 10k+ ports for 7500 users or can we limit the ports to 1 or 2k (or lower) for 7500 users and have QoS in place?

- The number of 7500 users is still growing yearly so, we want to be sure

best response confirmed by Aerton (Occasional Contributor)
Solution

Hi @Aerton , as @Christopher Hoard already mentioned: the client is using the port range documented by Microsoft.

The mentioned ports in the doc (Implement Quality of Service in Microsoft Teams - Microsoft Teams | Microsoft Docs) specifies the source ports used by the Client.

The destination ports differ on the call flow scenario. When we are talking about a direct 1:1 connection between two Teams client, source and destination ports for Audio are in the same range 50.000 to 50.019.

When we are talking about a Tams Meeting, the destination port for the session will be TCP 443 or more likely UDP 3478 till 34781.

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