How to use dnis numbers for inbound calls?

Hi everybody,

I am quite new to asterisk/freepbx. My toll free number provider forwards my two numbers to my asterisk server with respective dnis. Its fine as calls land in my box and are forwarded to a ring group.

I am not able to differentiate between these two number since both of them rings my softphones (xlite) as Unknown number.

Any help will be highly appreciated.