T21 headset send volume low

[sheilab]

Hi,
I'm a new user. My headset send volume is practically nil. Tried to export current configuration (config.bin) from T21 webgui, edited but it doesn't import. Goes through the screens as if updating but no change in the end.

From where can I get the y000000000034.cfg file with default settings? in case I need to have phone point to a server. thanks!!