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2.2.7. Pick Up Incoming Call
Description: Pick up an incoming call
2.2.8. Reject/Hung up Call
Description: Reject incoming call or hung up outgoing/active call
2.2.9. Three way calling control
Format: AT+ HFPMCAL=Param
Release held call or reject waiting call
Release active call and accept another call
Hold active call and accept another call
Description: User need to turn on 3-way-calling function use command AT+HFPCFG
2.2.10. Transfer Voice Audio
Format: AT+HFPADTS{=Param}
Param: Transfer direction (1/2)
Transfer voice audio from module to remote device
Transfer voice audio from remote device to module
Description: Transfer voice audio between module and remote device by default if no
parameter set