Hi
In translation-rule 1 numbers 82756 changing to 6 in any place of number, and in translation-rule 2 - 6 to 282756. After translation-rule 1 from 0282756807 you get 026807, so if you need to get 6807 then do it like this:
translation-rule 1
Rule 1 0282756... 6
And if you need from to get 0282756807 from 6807 then:
translation-rule 2
Rule 1 6... 0282756
(or just "prefix 028275" in dial-peer)