Grandstream access problem

hi people

Recently i detected a problem with access in my lan to some gxp 1610 devices , im on the same vlan , and my pc has the same dns and the same gateway that the phones i mencioned have, i can access to gxp 280 grandstream with same vlan and same gateway , they are older models form grandstream brand but i can access to them trough their ip address , and i can access through ssh conected to my server where i can build a tunnel and log in to the phones , how can i do to access from the local network to their ip , this only happens with newer models of grandstream like gxp 1610 and gxp1620 , with older phones i can acces both local and remote …