The PS3 phones home *ALL* the time. Every last program you run is stored in a log called the "pushlist" (google it), and regularly uploaded to Sony's servers. Every website your visit, every change you make... your entire play history is sent to Sony on regular intervals. Even while your PS3 is sitting idle, it's phoning home. This has been covered numerous times before.
I got that from a web site that is talking about the PS3 privacy patch. Since you are on an non-exploitable firmware you will just have to deal with your PS3 ratting you out on everything you do.
You can block those addresses using your router and stop it but you will lose the benefits of being on the newest firmware.