Whatever it is, all these phone calls could be produced by computer. That's 100% sure. So these calls are not reliable evidence.
Excuse me, you're ignoring the mountain of evidence that's staring you in the face - there are records of the many airphone calls.
That is reliable evidence, far more reliable than your claims of magic voice-morphing*
Phone calls were in fact made from the airplane using airphones. It doesn't matter if you deny this fact, it's still a fact. It just makes you out as a person who cannot deal with facts, and is not really interested in facts.
You cannot prove that the calls weren't made, so your claim is false.
*Magic Voice Morphing claims (originated by David Ray Griffin and others)
You're also ignoring the technical improbability of using voice-morphing software, even if it could theoretically work:
That is because, for each passenger on each plane, the plane booking would have to be known in advance, and voice samples of each potential person would need to be taken - you cannot do voice morphing without a series of samples, and it's not trivial.
Further, some people, randomly, used airphones (like flight attendants and various passengers), while others attempted to use cellphones. It makes no sense whatsoever if some people are already calling out on airphones for you to attempt to fake the cellphone calls.
No sense at all.
Clearly there was a hijacking, as evidenced by the CVR recovered, which you cannot deny. So since there was a hijacking, there is no reason to try to use voice-morphing, and no reasonable possibility for it to succeed even if you tried.
You're not going to fool ALL of the people who were telephoned. That's just a silly idea, and it is a disgrace to the memories of those people that someone such as yourself is perpetuating these kinds of malicious ideas.
You have no evidence that the calls were faked. In fact the real evidence is that many calls were made. You have failed. Your arguments are a disgrace to common human decency and honesty.