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Conferencing API Programming Guide — August 2006 27
7
7.Using Volume Control
This chapter provides information about controlling the volume level in a conference.
A party in a conference may wish to change the volume level of the received signal. This is
accomplished using the volume control feature.
The cnf_SetDTMFControl( ) function allows the application to define the DTMF digits that cause
the volume level to be adjusted up, down, or back to the default. This function points to the
CNF_DTMF_CONTROL_INFO structure which specifies whether volume control is enabled or
not and contains details on the digits used for volume control. Volume control is enabled on a
board basis.
The cnf_GetDTMFControl( ) function returns information on the DTMF digits used to control
the volume.
The default volume or origin is 0 dB. Volume is incremented or decremented by 2 dB at a time. The
maximum value for the volume is 18 dB and the minimum value is -18 dB.