I have connected vg248 across wan and tried to register it with CCM. I have enabled the DHCP option on VG248 and could not get the ip address assigned to it. I have other phones on the same subnet and they could register and get DN. IP help-address is configured and could ping the CCM and also from CCM to VG248 Connected voice ethernet subinterface.
Also, Auto registeration is enabled on CCM and tried adding manually via last 10 digits of MAC address as vg248 gateway.