EXAMPLES OF VOICE MODE OPERATION
- Greeting message recording (Put a MIC into dial-up line RJ11 jack)
    DTE                    DCE           comments
 -------------         -----------    ---------------------
 AT+FCLASS=8    --->                   Switch to voice mode
		<---       OK
 AT+VSM=?       --->
		      1;CELP;1;0;(9600)
		      2;ADPCM;2;0;(9600)
		      3;ADPCM;3;0;(9600)
		      30;ADPCM;3;0;(9600)
		      4;ADPCM;4;0;(9600)
		<---      OK
 AT+VSM=1       --->                   Select CELP compression method
		<---      OK
 AT+VLS=8       --->                   Activate external MIC on Line
				       Jack
		<---       VCON
 AT+VRX         --->                   Start to record
		<---       CONNECT
		<---       
 AT             --->                   Stop recording
		<---       
		<---       
		<---       VCON        Return to commnad state
 AT+VLS=0       ---->                  Deactivate external MIC on Line
				       Jack
		<---       OK
 AT+FCLASS=0                           Return to data mode
		<---       OK
- Voice file playing via internal speaker
    DTE                    DCE              comments
 -----------         -----------------  -------------------
 AT+FCLASS=8    --->                   Switch to voice mode
		<---       OK
 AT+VSM=?       --->
		      1;CELP;1;0;(9600)
		      2;ADPCM;2;0;(9600)
		      3;ADPCM;3;0;(9600)
		      30;ADPCM;3;0;(9600)
		      4;ADPCM;4;0;(9600)
		<---       OK
 AT+VSM=1       --->                   Select CELP compression method
		<---       OK
 AT+VLS=16      --->                   Activate internal speaker
		<---       VCON
 AT+VTX         --->                   Start to play
		<---       CONNECT
          --->
      --->
		<---       VCON        Return to commnad state
 AT+VLS=0       --->                   Deactivate internal speaker
		<---       OK
 AT+FCLASS=0                           Return to data mode
		<---       OK
- Voice file playing via line
    DTE                    DCE           comments
 -----------          --------------   --------------------
 AT+FCLASS=8    --->                   Switch to voice mode
		<---       OK
 AT+VSM=?       --->
		      1;CELP;1;0;(9600)
		      2;ADPCM;2;0;(9600)
		      3;ADPCM;3;0;(9600)
		      30;ADPCM;3;0;(9600)
		      4;ADPCM;4;0;(9600)
		<---       OK
 AT+VSM=1       --->                   Select CELP compression method
		<---       OK
 AT+VLS=2       --->                   Connect to line
		<---       VCON
 AT+VTX         --->                   Start to play
		<---       CONNECT
          --->
      --->
		<---       VCON        Return to commnad state
 AT+VLS=0       --->                   Deactivate line connection
		<---       OK
 AT+FCLASS=0                           Return to data mode
		<---       OK
- Answering machine (Voice call)
    DTE                    DCE           comments
 -----------          --------------   -------------------
 AT+FCLASS=8    --->                   Switch to voice mode
		<---       OK
 AT+VSM=?       --->
		      1;CELP;1;0;(9600)
		      2;ADPCM;2;0;(9600)
		      3;ADPCM;3;0;(9600)
		      30;ADPCM;3;0;(9600)
		      4;ADPCM;4;0;(9600)
		<---       OK
 AT+VSM=1       --->                   Select CELP compression method
		<---       OK
 AT+VLS=2       --->                   Connect to line
		<---       VCON
 AT+VTX         --->                   Start to play greeting message
		<---       CONNECT
          --->
      --->
		<---       VCON        return to commnad state
 AT+VRX         --->                   Start to record
		<---       CONNECT
		<---       
		<---       b      DCE detects busy tone
			     or               or
			   q      long period of quiet
 AT             ---->                  Stop recording
		<---             DCE deliver remaining data
		<---       
		<---       VCON        Return to commnad state
 AT+VLS=0       --->                   Deactivate line connection
		<---       OK
 AT+FCLASS=0                           Return to data mode
		<---       OK
- Answering machine (Fax call)
    DTE                    DCE           comments
 -----------          --------------   ------------------
 AT+FCLASS=8    --->                   Switch to voice mode
		<---       OK
 AT+VSM=?       --->
		      1;CELP;1;0;(9600)
		      2;ADPCM;2;0;(9600)
		      3;ADPCM;3;0;(9600)
		      30;ADPCM;3;0;(9600)
		      4;ADPCM;4;0;(9600)
		<---      OK
 AT+VSM=1       --->                   Select CELP compression method
		<---      OK
 AT+VLS=2       --->                   Connect to line
		<---       VCON
 AT+VTX         --->                   Start to play greeting message
		<---       CONNECT
          --->
		<---       c      T.30 fax calling tone detected
			    or                   or
			   5      DTMF digit '5' detected
          --->
      --->
		<---       VCON        Return to commnad state
 AT+FCLASS=2    --->                   Try to handshake Fax mode
		<---       OK
 ATA            --->
	    Switch to fax mode and answer fax call
			    .
			    .
			    .
- Answering machine (Data call)
    DTE                    DCE           comments
 -----------          -------------    --------------------
 AT+FCLASS=8    --->                   Switch to voice mode
		<---       OK
 AT+VSM=?       --->
		      1;CELP;1;0;(9600)
		      2;ADPCM;2;0;(9600)
		      3;ADPCM;3;0;(9600)
		      30;ADPCM;3;0;(9600)
		      4;ADPCM;4;0;(9600)
		<---       OK
 AT+VSM=1       --->                   Select CELP compression method
		<---       OK
 AT+VLS=2       --->                   Connect to line
		<---       VCON
 AT+VTX         --->                   Start to play greeting message
		<---       CONNECT
          --->
      --->
		<---       VCON        Return to command state
 AT+VRX         --->                   Start to record
		<---       CONNECT
		<---       
		<---       s      DCE detects silence
 AT             ---->                  Stop recording
		<---             DCE deliver remaining data
		<---       
		<---       VCON        return to command state
	      (DTE delete this silence file)
 AT+FCLASS=0    --->
		<---       OK
 ATA            --->                   Try to handshake data mode
	    Switch to data mode and answer data call
			    .
			    .
			    .
 Voice data compression.
 Voice data compression.
 ZyXEL Advanced Voice Capability.
 ZyXEL Advanced Voice Capability.
Sam Leffler / sam@engr.sgi.com.
Last updated $Date: 1998/10/12 20:47:51 $.