[Freeswitch-users] grandstream Gateway installation question

Dear all, I have a grandstream GXW4104 gateway (voip-landline gateway) and i have problems in installing it. The gateway (GW) registers as an extension (1005) to my server. I need to send landline calls to extension 1005 and change the SIP header (effective caller ID) to the new landline number (ex: 0352209xxx) could you help me with the dial plan? thank you regards, Sherif