Grandstream Gateway shows another did

Recently i have been experimenting troubles with a gateway where i have configured 4 lines that should have a DID 3056779865 for port fx1 and DID 78923845 for port fxs2 and DID 25690002 for port fxs3 but now i made a change of ports, and now when i check for the incoming calls the DID that shows in the screen of my phone is totally different , its something like 57xxxxxxxx , why does this happen and what should i do to fix it? iwant that the DID shown in the incoming calls be the same for the ports or the trunks i have on any port