cnPilot R190W, SOHO VoIP Trouble with DNS


I have the next situation, I have a grandstream PBX my remotes extension connect with DNS but when my extension enter at the LAN can't see the telephone book.
If I change the DNS Address for local IP work on Lan (No WAN), but if a put my DNS I can recived call but I can't see my telephone book.

I have forwarded this to our support and development teams.