HI! I can't get Analogue ports to ring on C.O. Calls works on intercom ringing, it is a Partner version Sd , R6.0 IPO 500 ihave the ringing on for the X26 , and have have tried different analogue tel.'s like my butt set and another panasonic Sli set . This is new system , i know i should upgraded it right. Any suggestions??Thanks