Panasonic KX-UT133-B VoIP Business IP Phone with HD Voice, Caller ID, 2 SIP Lines - Ideal for Office, Home Office & Remote Work Communication

We bought 28 of these phones because we wanted to be able to see the phone usage status of coworkers. However, when you have more than 4 or 5 BLF indicators programmed on the phone, the phone's performance drops off a cliff. So, when a call comes in, the phones don't all ring at the same time. Then, if the phone is ringing you can't push any buttons or answer the phone until it quits ringing. And if any phone in the system is still ringing (which they all ring at different times - the rolling thunder ring), you can't start talking until they all quit ringing, which leads to a long uncomfortable silence for the caller.Panasonic is blaming the multiple BLF indicators we have programmed (16 of them) for the problem. Pretty unhappy with the purchase at this point.