I have a DSC 1616 Powerseries that has hard wired motion doctors, But with 5 G I need a cellular bridge so the security company can continue to monitor my home. I'd like to do the upgrade myself but don't know where to start. Any recommendations on an up grade for the key pad? Current is DSC. that chimes when a door is opened. Would rather have a voice than chimes. Current six zones are enough. What parts are needed and where do I buy them?