Nei-how.... Welcome to the TP Forum. Am sure you find lots of resources - just do a "search" ....it works !
see you have a couple of more (other) posts here...
T4x - excellent machine - might be cheaper to get T6x Series - money better spent as T4x parts are gettting hard to get - even in HK
SSD - since you mention "pabx" ...might be moresuitable to get a LINUX install on laptop -and T6x is best of best for that OS
(can also do dualboot AND run VT stuff also) However - the SSD price alone - you could buy a new laptop! ....and SSD in x120 isnt much reliable when it comes to "heavy abuse" ...... I have lots of feedback from my Techs - they all wana GO BACK to T60/61P (14inch models).....
I have a personal x121 (sourced from Japan) with i5 and SSD in it > makes it superfast !! but the x120(USA+ Asia Model) is noth worth it since its AMD proc! ... I love my SONY z2+ raided ssds+1080p
model for my travels - love it love it!!!
Hope this helps