I've lost count on the number installed! All have been single cabs though many have been maxed in 8x16x8. The analog integration is good. Many sites are vm equipped. One site does after hours dispatching thru vm! I have returned one cab a two phones. I gave two year warranties when Comdial was doing one. Now Comdial is three years! A modem is always installed along with a UPS. A digital cordless is on the horizon with a Windows program interface. Loop start lines is all it will do. For it's targeted audience it's a solid inexpensive system.