Hello Haldar, Subra Raj (external - Service)
To visualize your Active Directory replication topology, I recommend using ADTD.Net or Repadmin with Visio — both are free and community-supported tools. Microsoft does not currently offer a built-in tool that covers everything.
Oh and for the call you need, I would suggest you to contact MS support and raise a ticket to seek help from the support engineers. Try this out: https://support.microsoft.com/en-us/contactus/
Do you find my answer helpful to you? If yes, please let me know by hitting "Accept Answer", I'm happy to know.
Harry.