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Teams optimization ports update

Microsoft is updating their optimization IP addresses to Microsoft Teams. In fact, when you deploy Microsoft Teams within a company, Microsoft recommends that you open an IP address range to the cloud, excluding any SSL/SIP inspection engine , Antivirus, UTM

Microsoft therefore updates the range previously 52.120.0.0/14 to 52.122.0.0/15. No impact here since range 52.122.0.0/15 is included in range 52.120.0.0/14. So you just have to update your firewall rules.

Source:
Microsoft – firewall requirements
Microsoft – URLs and IPs

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