To configure the Lync Front-End SIP Virtual Service, follow the steps below:

  1. Select View/Modify Services under Virtual Services in the left-hand navigation.

  2. Click Modify on the Lync Internal Front-End SIP Virtual Service.
  3. Expand the Real Servers section.
  4. Click Add New.
  5. Enter the Real Server Address.
  6. Confirm that Port 5061 is entered.
  7. Click Add This Real Server.
  8. Add additional Real Servers as needed.