To put this into perspective:
The 100 Analog that you have is the older brother of the SX200D,
which is the older brother of the SX-200D/L,
which is the older brother of the SX-200 EL,
which is the older brother of the SX-200 ICP,
which is the older brother of the Mitel 3100.
I know that I must sound like a broken record -- I mean an MP3 stuck on "repeat" -- but you should already have been thinking about when and how you intend to upgrade this phone system.
Just for perspective.
