A bluetooth accessory(headset, car kit etc) usually supports one or more of following bluetooth profiles:
(1) Bluetooth HFP/HSP (mono)
(2) Bluetooth A2DP (stereo)
(3) Bluetooth SAP/SIM/rSAP
If your accessory supports HFP/HSP + A2DP, Nokia phones automatically use A2DP.
According to the user's feedback, if your headset or car kit supports only HFP/HSP, Boldbeast may have problems with beep suppression during phone call recording, if it supports A2DP or SAP/SIM/rSAP, currently no problem is reported.
You are welcome to post your result here.