Yealink T40PThe smallest T4 — three lines and the T4 chassis on a budget.

Why the T40P is on the catalog.

The T40P sits at an odd spot in the catalog: it costs $99 with three SIP lines and 10/100 ethernet — almost the same money as the T23G ($89, three lines, gigabit). The T23G arguably wins on spec at this tier, and the T40P's main selling point is being part of the T4 chassis family. If you are standardizing on T4 phones across the office and want the cheapest T4 for back-office desks, the T40P is the answer.

Where the chassis-matching argument actually matters: facilities that have invested in T4 spare parts, T4 wall-mount brackets, or T4 handset cords as standard inventory. Mixing in a T2-series T23G means stocking a second set of accessories. The T40P keeps everything uniform — same handset cord, same wall mount, same Yealink RPS template — for $10 over the T23G.

Where to skip it: any new deployment not already committed to the T4 family. The T23G beats it on every spec at $10 less, the T33G beats it badly at $20 more (color screen, four lines, gigabit), and the T40G fixes the gigabit weakness for $20 more. The T40P exists for one narrow uniformity reason and that is it.