Connect pilot pool to legacy Edge Servers
After deploying Skype for Business Server 2019, you need to configure a federation route for your site. In order to use the federated route that is being used by the legacy installation, Skype for Business Server 2019 must be configured to use this route.
To enable the Skype for Business Server 2019 site to use the Director and Edge Server of the legacy deployment, use Topology Builder to associate the legacy Edge pool.
To associate the legacy Edge pool by using Topology Builder
Open Topology Builder.
Select your site, which is directly below the Skype for Business Server node.
On the Actions menu, click Edit Properties.
In the left pane, select Federation route.
Under Site federation route assignment, select Enable SIP federation, and then select the legacy Director, or the legacy Edge Server if no Director is listed.
Click OK to close the Edit Properties page.
In Topology Builder, under the Skype for Business Server 2019 node, navigate to the Standard Edition server or Enterprise Edition Front End pools, right-click the pool, and then click Edit Properties.
Under Associations, select the check box next to Associate Edge pool (for media components).
From the list, select the legacy Edge Server.
Click OK to close the Edit Properties page.
In Topology Builder, select the top-most node, Skype for Business Server.
From the Action menu, click Publish Topology, and then click Next.
When the Publishing wizard completes, click Finish.