We are evaluating 3cx to replace an outdated digital pbx system. I bot a few Polycom phones (ip550 and ip335). After a few issues I got the 550's setup and a SIP account activated. But, I was having problems with the phones. no dial tone, etc. even though the option "pbx provides dialtone" was checked. Then I read I should update the bootrom. Okay. Now the fun begins... The documentation says to always use the latest 3cx tested versions. Where the hell are these? I can find them anywhere. So I downloaded the latest stuff from Polycom. The phones boot up and display their extension number, etc but 30 seconds later they reboot... Menu key doesn't work to try and reformat the phone, etc. Now I don't want to plug in any more phones.... Suggestions on how to fix this?