Skype for Business Online Federation
The Lifesize cloud-based service supports the Skype for Business Online environment.
If your Skype for Business Online deployment is not configured as an open federation, you must add lifesizecloud.com as a federated partner by logging in to the Skype for Business admin center and adding lifesizecloud.com as an allowed domain.
For information about configuring your firewall, go to the Skype for Business Online section in Open network ports.
The local network where the Skype for Business client resides must also permit outbound UDP.