SCCM Secondary Site ports requirements

I have recently deployed SCCM 1802 on our primary site with seperate SQL 2014 Server. Now, I need to deploy secondary site for my remote location. I need to know which ports will be opened between primary site server and secondary site server? Do i need to open any port between SQL server and secondary site server as well? And what will be the direction. I have read articles which says ports 443, 445, 1439 and 4022 but all are when primary site server and SQL server are co-located. I have seperate servers on primary site which is confusing me. On secondary site database will be co-located.