Puzzled before buying USRobotics 56K int modem/ w voice

(1)Why OEM USR56K int modem w/voice comes with an audio    cable which should be plugged into the white socket on    the sound card while other int modem I used before don't    use an audio cable? What is the purpose of the audio    cable on the modem card?
   What will be the difference in using the audio cable and    not using the audio cable for the USR56K int modem?
(2)The audio cable socket(the white thing) on the sound card    is already occupied by the audio cable from CDRom drive,    how can the audio cable of the modem be connected?
 
man_15Asked:
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nebworthConnect With a Mentor Commented:

   This is a voice modem which has the option of connecting its audio internally to the sound card.  Basically, if you use the speakerphone function of the modem, this allows you the ability of hearing the sound (the phone conversation) through the speakers connected to the sound card.  This cable is not necessary for proper function of the modem, though, and if you never use speakerphone, you'll never miss it anyway.  If there is no room for the wire on the sound card (a lot of sound cards now come with extra connectors for this sort of thing), and you really want or need to use the speakerphone, run a little microphone patch cable from the speaker out on the modem (on the plate at the back of the card) to the line in on the sound card.
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man_15Author Commented:
Mr nebworth,
Thank you for your answer. But I still don't understand
(1) the difference in features between modem w/voice and not w/voice.
(2) My previous modem is a Sierra Based Voice Modem, it don't need the audio cable to work.
(3) The seller of the USR56K modem said w/voice means with voice mail. Is it true?

Best regards
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nebworthCommented:

    Yes, it's true.  The USR56K doesn't need the audio cable in order to work.  It's merely an accessory.  You know how modems have little internal speakers?  Well, this cable lets you use the external speakers connected to the sound card.  That's all.  It's like having a wire from your telephone to your stereo, so you can turn up the amplifier and listen to people talking out loud.
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nebworthCommented:
  Oh... ok...
   A regular modem doesn't listen to audio the way we do.  All it is capable of is listening to data coming over the phone line.  A voice modem (or modem with voice capability) can take the raw audio off the phone line and process it.  If somebody is talking on the other end of the phone line, the voice modem can record it, or even play it back over speakers or through ear phones.  If you have that little wire attached, you can hear the modem through the sound card.  Now there are a few different types of voice modems.  Some only have voice mail features, so all they can do is record peoples' calls.  Others have speakerphone and playback features, so you can listen to calls, or screen them.  Others have full duplex speakerphone so you can use your computer as a hands free speakerphone telephone.  
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man_15Author Commented:
Dear Nebworth,

Thank you for your answer.

Best Regards
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nebworthCommented:
  You are quite welcome.  I try to do my best.
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