I had to replace the DS2 mini for my front door and gate after my integrator accidentally bricked them when updating to the latest OS. It seems firmware on these had to be udpated first. Anyhow, they sent me 2 replacements under warranty and the front door has worked fine, but the one at my gate, it only rings on the house speakers but not on any touch screens or cell phones. C4 has had me check all of the settings and we have spoken to tier 2 support and one of the engineers with no luck. They have since sent me 2 more replacements, but all with the same issue. I can't see hardware being the problem, so I'm wondering if anyone here has experienced anything similar or had any suggestions?