The link OP provided explains it a bit better:
0=o, 1=i, 2=n, 3=m,4=k, 5=s, 6=b, 7=t, 8=f, 9=g
- 2 digit numbers with 0 or 1 are pronounced as they are, for example 17=it.
- other 2 digit numbers get an “a” in between the numbers, for example 45=kas
- twin numbers like 22, 33, 44 are pronounced with an oe-sound (like in shoe), for example 22=noe, 33 =moe, 44= koe ; this provides important variation in sounds.
- 00 and 11 are pronounced as poe and loe for practical reasons.