Add Teams Media IP subnets into the route table

TeamsRouting.ps1

$intIndex = "" # index of the interface connected to the internet
$gateway = "" # default gateway of that interface (change this)
# Query the web service for IPs in the Optimize category
$destPrefix = "52.120.0.0/14", "52.112.0.0/14", "13.107.64.0/18" # Teams Media endpoints
# Add routes to the route table
foreach ($prefix in $destPrefix) {New-NetRoute -DestinationPrefix $prefix -InterfaceIndex $intIndex -NextHop $gateway}

Get Parameters

In the above script, $intIndex is the index of the interface connected to the internet (find by running get-netadapter in PowerShell; look for the value of ifIndex) Note: you can add multiple network adapters. I.e when I plug into my docking station I don't use the laptop's network adapter I use the docking station adapter.

$gateway is the default gateway of that interface (find by running ipconfig in a command prompt or (Get-NetIPConfiguration | Foreach IPv4DefaultGateway).NextHop in PowerShell).

You will need to execute the powershell script in administrator mode and you will most likely have to bypass the execution policy. You can run the below command to do this

powershell.exe -ExecutionPolicy Bypass -File .\TeamsRouting.ps1

Testing The Change

Once the script has been executed you can test the path via the local ISP to this endpoint that should resolve to an IP in the Teams ranges we have configured for split tunneling.

Powershell : tracert worldaz.tr.teams.microsoft.com

Full MSDN Documentation

It's simple to remove them, you can type "route print" to print the routing table
then do 

route -p delete 52.120.0.0/14