Hypermedia gsm Gateway setup and costumization

i have hypermdia hg4000 series i need to configure hypermedia gsm gateway to work fro call termination. with the following features. the most important : 1-configure the gw to with my softswitch to reicieve calls ( need setup because internal router is reset) also i would prefer the following features 1-topup by sms 2-create costum ussd scritps to automate running on sim cards. 3-abilty to change multiple imeis at once. every new feature is welcomed.