Installation of E-Rec System

Dear All

I need to install E-rec and TREX on our Portal System which has NW 7.0 SP 25. We also have ECC 6.0 Ehp 4 installed on a seperate server and it has E-REC 604.

If i apply E-Rec Business Packages on the portal (EREC ADMIN, RECRUITER & COMMON PARTS), and perform system connections between my EhP4 system and Portal, would that be enough?

Is it a pre-requisite to have NW 7.0 EhP1 installed before i apply the E-REC business packages on the portal system. my portal system runs on NW 7.0 SP25?

Please advise.

Thanks

Ahmed Nawaz