Here is my video review of the HP 4120.
No surprises with the Lync Phone Edition firmware. HP has brought some new things like “quiet return to cradle”, bigger buttons, no mechanical hook switch, and Ethernet indicator lights. But no large surprises, just another solid Lync certified IP phone.
-quiet "return to cradle" design
-2 tilt angles (some have requested higher tilt angle)
-Ethernet indicator lights (can blink in low light office environments)
-narrower than cx600 (taller as well)
-wall mountable (by how cables are routed)
-no mechanical off/on hook switch (to wear out)