How to record a voice message in WhatsApp/Viber/Telegram through bluetooth headset?

I have two phones connected to one Plantronics Voyager 5200 headset. Everything is working fine except voice messaging in WhatsApp/Viber/Telegram. So, I can LISTEN to voice messages. But if I try to RECORD them — sound goes through default phone mic and NOT through headset mic... It's so annoying. Any ideas how to fix?

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