A bit of an aside, but I'm a bit puzzeled by this statement. There are many phonetic alphabets invented through history of course. Are you saying they all have the same root or inspiration?
I think you're thinking "alphabet", which indeed, has been independently invented multiple times. The most widely used alphabet is the one derived from the Phoenician script. Other alphabets that were independently invented include the Brahmic scripts and the Hangul script.
However, the "phonetic alphabet" (also known as the NATO phonetic alphabet) was only invented once. https://en.wikipedia.org/wiki/NATO_phonetic_alphabet#
In contrast, alphabets have been invented multiple times completely independently without knowledge of the others.
There are many other writing systems but they tend to be pictorial or syllabic.
https://www.britannica.com/topic/writing/Types-of-writing-sy...