Commands to enable and disable speakerphone.
One or more command strings can be used. For example,
HKR, SpeakerPhoneEnable, 1,, "at#vls=6" HKR, SpeakerPhoneDisable, 1,, "at#vls=6" HKR, SpeakerPhoneDisable, 2,, "at#spk=0,15,," HKR, SpeakerPhoneDisable, 3,, "at#vls=0"
These commands are issued after a call has been connected in voice mode. The SpeakerPhoneEnable command is sent when the TAPI function phoneSetHookSwitchMode is called with the PHONESETHOOKSWITCHDEV_SPEAKERPHONE and PHONESETHOOKSWITCHMODE_MICSPEAKER or _SPEAKER or bits set.
See also Overview of speakerphone modes in the Modem Development Kit documentation.