The X16 comes fully equipped for 4 lines and 16 stations. There is an option slot that allows you to add two more CO lines or a two-port SIP module.

Then nice thing about this system is that it allows up to four stations to share the same single pair of wires. Yep, one pair bridged out of the KSU to four separate stations with unique extension numbers and features. Oh and yes, they can all be used simultaneously.

This is great for situations where cabling might be difficult, like in residential installations. No analog station ports or wireless, yet.

Ed Vaughn, MBSWWYPBX