These two examples sound kind of weird, so let me add a particle to make them sound natural and understandable.
> A.
> B.
Now the two meanings:
> 1. (I believe) **I can meet you without hearing your voice**.
>
> 2. **I believe without hearing your voice** (that I can meet you).
>
I think in most cases B means 2. But I can't say for sure that B never means 1. Punctuation is sometimes arbitrary.
As for A, it seems completely ambiguous to me. In fact, I find this sentence somewhat hard to understand.
In order to make it mean 1, inserting a comma like may also be possible.