The SL2100 has 4 built-in Mobile Extension licenses. This allows a cell phone to connect to the 2100 and act like a single line set. At first I mistakenly thought I needed an app on the cell phone, like the MLC app that I used on the 9100. But couldn't find one for the 2100 (because its not needed).

Once I realized its called Mobile Extension, and not MLC or uMobility or anything else, I think it's a matter of setting up the mobile extension in the 2100. The Features and Specs manual has some info in it, although it looks a little cumbersome for the end user. Has anyone used this? How well does it work?

Thanks.
Jim