Dinstar DWG2000-1G no sound on caller side


I have dinstar connected to my FreePBX system. When SIP number recieve call it is redirecting through dinstar and it’s calling to my mobile phone number from dinstar(GSM).
Everything works perfect but sound. The caller can not hear me(he dont have even dial tone) but I can hear him.
It should be something with dinstar, because when I redirect calls to my IP phone everything is OK.

Do you know maybe what could be wrong with this?

Best Regards ')