Linksys SPA2102 - no voice

I Just purchase the key, I have setup this Linksys SPA2102, I belive it's correct setup
But I have issue with for calling or receiving phone
When some one call, it rings but can not heard any thing whatever he spoke, on other hand whatever I talk other person can heard clearly.
Same thing, when I call other person can hear what I talk, but I can't heard anything what spoke.
I am running firmware v 5.2.5,
I have other phone with same adapter, with different firmware version, I don't have any issue.
Is that anyone can help me?
But I have issue with for calling or receiving phone
When some one call, it rings but can not heard any thing whatever he spoke, on other hand whatever I talk other person can heard clearly.
Same thing, when I call other person can hear what I talk, but I can't heard anything what spoke.
I am running firmware v 5.2.5,
I have other phone with same adapter, with different firmware version, I don't have any issue.
Is that anyone can help me?