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Discuss Pseudo visual voicemail at the General - Hackint0sh.org; Hi I know visual voice mail is AT&T only, but I was wondering if it ...
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    Default Pseudo visual voicemail

    Hi

    I know visual voice mail is AT&T only, but I was wondering if it could be simulated on the phones that use the Geohot (or upcoming software) unlocks?

    What I'm thinking is that on non-AT&T carriers, voicemail messages must be encapsulated in some form. Or put another way, when you press listen on your voicemail, the sound files must arrive on the phone inside some sort of stream format. If so, perhaps the format header has a hackable structure where message info can be extracted and formatted into a visual voicemail like presentation.

    If that is possible then it would only be a matter of having a daemon poll your inbox at some user specified interval, automatically download all your voice messages and generate a VVM list.

    Does anyone with a geohot hacked phone have the know-how to intercept communications between the phone and alternate carrier voicemail to see if the individual messages have a hackable structure?

    Seems like it could be an interesting workaround if it's possible.



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    Unlikely, but you should check out SpinVox (http://www.spinvox.com) - a nice alternative to true visual voicemail.

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    Quote Originally Posted by cuzco View Post
    voicemail, the sound files must arrive on the phone inside some sort of stream format. If so, perhaps the format header has a hackable structure where message info can be extracted and formatted into a visual voicemail like presentation.
    I think you hav no idea how a call is being made on the GSM network...
    Calling your voicemail is the same as calling another person, there's no *special* encoding like you seem to assert

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    Quote Originally Posted by jyavenard View Post
    I think you hav no idea how a call is being made on the GSM network...
    Calling your voicemail is the same as calling another person, there's no *special* encoding like you seem to assert
    You're right. I don't. But voice messages typically are preceeded by something like "Message 1: Hi. It's so-and-so. Just calling to see if you still want to catch the Bourne ultimatum tonight. Call me back. Bye."

    The fact that messages are segmented into "message 1," "message 2" etc could be utilized in a hack. Along with the audio portion of the message, there may be transport info that could be used to create a list of messages.

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    even thou it could be possible, this would be very unstable.
    why? first of all, some provider tell you first the time, then the massage, other first the massage then the time etc.

    its also not always the same duration for the number (111 is shorter than 555).
    and as soon as a provider changes a little thing, the whole programm needs to be reconfigured.

    then there would be a need of a speech-recognition for "zero seven nine" into "079".

    to do this, its just too complicated and too unstable (as said, the provider changes a bit, and the whole system is wrong). then again, there are a total of maaany many different providers, and there is no standart saying "first 10 seconds for number, then 10 seconds for date".

    just accept that this is too complicated.

    as soon as you have the massage, its easy to do, but till you get the massage, good luck

    as written here
    http://www.hackint0sh.org/forum/showthread.php?t=3491


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    Quote Originally Posted by fabiopigi View Post
    then there would be a need of a speech-recognition for "zero seven nine" into "079".

    just accept that this is too complicated.

    as soon as you have the massage, its easy to do, but till you get the massage, good luck

    as written here
    http://www.hackint0sh.org/forum/showthread.php?t=3491
    If messages arrive as a raw audio stream then yeah it's not worth it. But if they are wrapped into some sort of block and then played back. It might be worth a look. What I'm thinking would be sort of like an image file. It would be a herculean task to write a facial recognition app to process photos and identify people in an emailed jpeg but the jpeg itself has a wrapper with meta information. If voicemails are files then it would be possible. If not then it would be way too much of a pain.

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    the thing is they ARE NOT "files" they are a regular phone conversation! this is what you seem to be neglecting.

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    Quote Originally Posted by RVN84 View Post
    the thing is they ARE NOT "files" they are a regular phone conversation! this is what you seem to be neglecting.
    OK.

    I've never done any low level device programming so am admittedly out of my element with this stuff, but even with "regular phone conversations," it's not magic. There is some mechanism by which the signals reach your phone (radio as I understand it) Are the signals digitally encoded? Or analog?

    If the signal goes more or less directly from the radio component to the speakers then there is indeed no place to insert a "message reading" hack. Is that how it works? Or does the signal arrive in digital packets which are passed from the radio to some other iPhone chip for conversion into signals that drive the speaker?
    Last edited by cuzco; 08-27-2007 at 01:04 AM.

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    Well obviously it has a whole lot of processing in the middle, but these messages dont have "headers" like you seem to want to find. There are codecs and D2A conversions in place, since it is digital (obvious for GSM), but it is the same as a CD, its digital too, but doesnt have special headers and such that would say "message 1:" "message 2:", etc...

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    Quote Originally Posted by RVN84 View Post
    Well obviously it has a whole lot of processing in the middle, but these messages dont have "headers" like you seem to want to find. There are codecs and D2A conversions in place, since it is digital (obvious for GSM), but it is the same as a CD, its digital too, but doesnt have special headers and such that would say "message 1:" "message 2:", etc...
    Tracks on a CD do have headers but I know what you're getting at.

    Last question. Although it isn't enough information do anything especially useful, would the time between the end of one message and the beginning of the next be separated by some sort of "end of message/start of message" byte? I'm not looking try to do anything with this, just curious.


 

 
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