LDAP and massive FW push.

Hello YeaLink team!

Is there a way to get the phone to get pointed to an Exchange/AD server using LDAP to retrieve directory information? I tried setting up LDAP on my AD server and it failed. I pulled the directions from YeaLink's manual. Also, is there a way to do a massive FW push? I need to update 75 phones.

Thanks,
Ray