Ports needed for Site Server to CEM gateway

Hi After looking at the follwing links, I am still not clear what port needs to be opened up between Site Server and CEM gateway and how to customize it. Please if someone can help. 

CEM to SMP is very clear but for Site server there is no mention how the communication will occure. 

http://www.symantec.com/connect/forums/ports-be-op...

https://support.symantec.com/en_US/article.DOC6770...