2N NetSpeaker Manual page 92

Smooth Change of Source Volume
Enter the command to set the source volume. Defined by CmdPar1 =
SessionId, CmdPar2 = SourceId, CmdPar3 = volume and CmdPar4 = transition
time from the current value to the new one.
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Request
<msg Id="CTI_NSPK_CMD_REQ">
<CTI_NSPK_IE_SES_CMD Cmd="SET_VOL" CmdPar1="0x1"
CmdPar2="0x1" CmdPar3="10" CmdPar4="2"/>
<CTI_IE_REFERENCE Ref="0x420"/>
</msg>
Response
<msg Id="CTI_NSPK_CMD_CONF">
<CTI_IE_REFERENCE Ref="0x420"/>
<CTI_IE_RESULT Result="OK"/>
</msg>
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