Compression Methods

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2003-05-15
2003-05-28
  • William Niu

    William Niu - 2003-05-15

    Can someone please tell me what compression methods (which I use to run the serial provider) my modem supports? Here's what I got when querying it with AT+VSM=? command:

    0,"8-Bit Linear",8,0,(4800,7200,8000,9600,11025),(0),(0)
    1,"16-Bit Linear",16,0,(4800,7200,8000,9600,11025),(0),(0)
    2,"4-Bit ADPCM",4,0,(4800,7200,8000,9600,11025),(0),(0)
    128,"8-Bit Linear",8,0,(4800,7200,8000,9600,11025),(0),(0)
    129,"16-Bit Linear",16,0,(4800,7200,8000,9600,11025),(0),(0)
    132,"4-Bit ADPCM",4,0,(4800,7200,8000,9600,11025),(0),(0)
    140,"CL1",8,0,(4800,7200,8000,9600,11025),(0),(0)
    141,"3-Bit ADPCM",3,0,(4800,7200,8000,9600,11025),(0),(0)

    Btw, when I used MS TAPI provider, it recorded OK. But for the greeting msg, sometimes it plays.... It also detects DTMF tone OK.

    Thanks

     
    • Anuj Kumar Tyagi

      Hi,
      I am in serious trouble. I have set the classpath of comm.jar, audiosp.jar, xtapi.jar, serialsp.jar, mstapisp.jar, jtapi.jar and also copied the xtapi.dll in the system32 directory. I have modem installed on my machine. But when i run the Outcall class, i am getting the following runtime errors:

      java.lang.NullPointerException
      javax.telephony.InvalidArgumentException
      java.lang.NullPointerException
      MyOutCallObserver.callChangedEvent
      java.lang.NullPointerException

      Please help me......

      thanx

       

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