galaxy s8 bluetooth viber problem

[Android Central Question]

hi guys i bought a gear s3 and i connected it via bluetooth with my galaxy s8. I know that i cant recieve calls on my watch from viber or whatsapp but my problem is that when someone calling my on viber the sound comes trough the earpiece on my phone and when the phone is on vibrating only sound off it rings! when i deactivate bluetooth its normal again