Transport Relay Evaluation - CQD
Published Dec 14 2017 01:12 PM 8,423 Views

As we've shared at Ignite and in other blogs, there is a change underway to Office 365 Skype for Business. With the new IP and Port ranges in use for both Skype for Business and Teams when using Transport Relay there are customers who are having challenges completing media setup using these IPS and ports.  When reviewing quality metrics a problem could be detected which indicates users in the tenants organization will fail when attempting to join meetings, share video, share audio, or share applications. Among the possible causes for this failure we know that customer firewall, proxy, or VPN device/software and client level software can influence customers ability to use Skype for Business and Teams.


As we work to complete this change it is paramount that customers review and update Skype For Business Online or Microsoft Teams rules on their firewalls, proxies, and VPN devices/software. Specific attention should be given to the following IP ranges, ports, and protocols that are used for media connectivity:

IPV6 Ranges:






IPV4 Ranges:


TCP 443

UDP 3478, 3479,3480, 3481


For additional information please reference the following articles:


We have also prepared a template for CQD online that you can import that will help narrow down network infrastructure devices in a customer environment that could be impacting the ability to establish media.  Please see the template attached to this blog and we would love to hear from you.



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‎Jan 18 2018 07:39 AM
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