If you think it is the wiring, plug the analog phone directly into the partner system. Also, double check that you have the lines setup for immediate ring on those extentions. Make sure you are programming the correct exts. Pickup the analog phones, intercom a display screen phone to check what exts you are using. To program line ringing, go to ext 10 or 11, dial feature zero zero, left intercom twice, right intercom once, dial ext number, touch the lines till they are lit up steady. If you need additional help, let us know.