I have an SV8100 installed at a small church. They only have 3 phones and 2 outside copper lines. The caller ID doesn't work thru the phone system but if I put the cheap Wal*Mart units in they works fine. I've worked with NEC on this, did traces and other trouble shooting procedures, and after many hours still no caller ID. They said the phone system is smart, thats why it doesn't work and the cheap units aren't smart thats why they work. Huh? Anyone else ever seen this?