Param:(0~5) Network signal strength of remote device
3.2.5. HFP Device Network Operator Selection
Param:(UTF8) Network operator selection of remote device
3.2.6. HFP Device Roaming State
Param:(0/1) Roaming state of remote device
3.2.7. HFP Device Battery Level
Param:(0~5) Battery level of remote device
3.2.8. HFP Device Manufacture
Param:(UTF8) Manufacture name of remote device
3.2.9. HFP Phone Subscriber Number
Param:(ASCII) Phone subscriber number of remote device
Param:(0/1) In-band ringtone supported