Low volume level on Viber

[kulvershtukas]

Hi, does anybody have the same issue? The other side hears me very good, but volume of internal earpiece in my Z2 is incredibly low. At the same time usual call with the same set up is very good. 
When I use Viber through speakers, the volume level is good. 

[hop3y]

Theres a low volume level on most notifications and is a known bug. Search the forum, theres hundreds of threads.

[kulvershtukas]

I am talking about voice level of other side during conversation, not about notifications. 

[NathiSony]

@kulvershtukas wrote:

Hi, does anybody have the same issue? The other side hears me very good, but volume of internal earpiece in my Z2 is incredibly low. At the same time usual call with the same set up is very good. 
When I use Viber through speakers, the volume level is good. 

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 Same Problem, even dropped calls.