Before I read through other's posts, I'll tell you exactly what it is, and how to fix it.
Firstly, you have to realize, when you first begin to do this, you are only JUST learning how to use your faculties... ie. sight, smell, feeling, etc. this includes your ability to "talk". I say it like this because while projecting yourself, or phasing, you are still trying to use your physical faculties, ie. what you've learned to use since you were born. So you are attempting to "talk" even though you have no vocal cords to be able to manipulate.
Whenever someone "talks" within the phase, they are only projecting their thought of what they are saying. If you understand how this works, great, if not, here goes; since we are in a state of pure consciousness, or "thought" simply us talking inside our heads those around us in that reality would be able to "hear" you.
Remember, everything that we experience while in the phase, is only our mind/body trying to settle the fight happening between them. When you "hear" something, you are not "hearing" it, you are perceiving the thought someone sends to you that they think it should sound like. ie. I read "The running fox jumps the fence" inside my head. I hear me saying it, I hear sound to it, I hear what my voice sounds like if I was to read it out loud, but yet, there is still the sound of the thought, the thought of me saying it out loud, but I'm still only saying it inside my head.
Now to help those who read this:
When wanting to communicate with other projectors or phasers, don't complicate it beyond what I'm going to describe to you. This is "Communication 101" in a rough n' tough quick style for you.
Get used to having conversation in your head, talk as much as you can, switching from vocal cords to speaking in your mind, you can repeat a paragraph after reading it out loud in your head just to practice. If you wan't others to recognize your voice well, this is what you want to do.
Now that you can enunciate within your own mind, it's time to start build strong "thought" or intention behind the thought. While you think about the subject, talk about the specifics, which is the real reason behind communication, specific details.
Why I'm saying to start building the strong intention behind your thought is for a couple things. For highly experienced projectors like myself, I can understand what you are trying to say before you actually decide what words to say it with. In other words, reading your thoughts. Now everyone naturally receives thoughts, knowledge and information. It's whether or not they are aware of it that matters, after you are aware of it, anyone can learn easily.
Another huge factor in this is your own intent, if you are not entirely sure why or how you are going to accomplish WHATEVER it is in this reality you want to do, you have to be SURE what/how you do it. Like an instinct.
On a side note, remember, practice makes perfect. You can't be going and meeting the Plaedians within your first projection!
If everything we perceive is a reflection of the past and our actions dictate the future, what creates our reality? The choices we make, or the past that made us make the choice?