[SR-Users] using kamailio as sip server

Hi, I'm new to Kamailio I need to have a kamalio as sip server which do a trunk to NGN Center(like a friend peer trunk in freepbx). I need to outgoing calls go through kamailio and forwarded to ngn(multi did values, a range of numbers ...) extensions will register on kamailio I need incoming calls forwarded to an extension or a pbx server, doesn't matter and both are good ... that server will have heavy traffic about 1000 concurrent calls... I tried a successful kamailio installation but I don't know how to config that for my purpose. even I tried installation of dsiprouter over a fresh debian 9 but stopped on pyspark installation. please give me your helps, advises, hints or ideas! best regards