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So, if the recording sits at the carrier level and not on the phone, how does jailbreaking help?

By JBing the phone, it allows you get access to where the AMR file is so you can substitute a custom recording in place so that when you approve the new recording as the final step, the custom recording is uploaded to the carrier's server.

On my JB phone, I was able to locate the greeting.amr file and dropboxed it to my computer and played it back.

I see no reason to think the rest of the steps outlined won't work. I do not believe the directory location is accessible if you have a stock iOS phone however.
 
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I ran out and bought this kind of silly "iRig2" that did allow me to pass the analog signal from my laptop and record from that. The sound quality is better than recording the sound played from a speaker, but it's not a lot better. The original file is crisp and professional sounding, but not once passed through the iPhones A/D converter. This is as far as I've gotten so far.

I would make an educated guess that the final recording at the carrier is at a much lower quality/resolution than your original file. Also, it is an unknown what quality audio is being transmitted over the phone call. I'm sure you've noticed a difference in audio quality between phone calls and Facetime.

Also, are you creating a mono audio file for the message? If not, you should. There are sonic issues when a stereo file is simply converted to mono and some of what your hear may be due to those issues.
 
In the end you're putting way too much time and effort into this.
Its just a voice message greeting.
Most people when the voicemail picks up they hang up and text you instead.
If it doesn't sound as high quality as the original mp3 it doesn't even matter.
Dont lose any sleep over it.
My wife was pretty serious about this:


:D :D
 
I would make an educated guess that the final recording at the carrier is at a much lower quality/resolution than your original file. Also, it is an unknown what quality audio is being transmitted over the phone call. I'm sure you've noticed a difference in audio quality between phone calls and Facetime.

Also, are you creating a mono audio file for the message? If not, you should. There are sonic issues when a stereo file is simply converted to mono and some of what your hear may be due to those issues.

Those are all really good points. I recorded in mono.

I wonder if the .amr on the iPhone gets uploaded to the carrier, or is actually played and re-recorded again... If it's the latter, I might try one more time by calling Verizon voicemail and recording it directly there. But this is getting ridiculous.
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In the end you're putting way too much time and effort into this.
Its just a voice message greeting.
Most people when the voicemail picks up they hang up and text you instead.
If it doesn't sound as high quality as the original mp3 it doesn't even matter.
Dont lose any sleep over it.

Agreed. Normally, I wouldn't be so determined, but it's for a business phone for a creative service, and I just want it to sound as clean as possible, if possible.
 
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My wife was pretty serious about this:


:D :D

I hate long voicemail recordings. This is on the long side.

Fun to listen to 1-2 times...but after that, nope. Too short is equally not as good.

And if you are job-hunting...you don't want anything but your own voice in the recording.
 
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I hate long voicemail recordings. This is on the long side.

Fun to listen to 1-2 times...but after that, nope. Too short is equally not as good.

And if you are job-hunting...you don't want anything but your own voice in the recording.
All valid points.

Personally, I just use the carrier message. If you have my phone number you know who and why you are calling - or you're a marketer.

But my wife wanted me to put it on her phone so a directive was issued. :)
 
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