[sr-dev] Simple module - beginner questions

Hey Guys, We are in the process of writing our first Kamailio module and would need if possible some guidance. Following questions came up: * We need to keep track about call-start and call-stop events. Do you recommend us dialog or dialog-ng module for that? * To learn the basic of Kamailio module development, can you recommend us a very simple and basic module to have a look on (like a hello world or something). * We would need to be able to control calls (eg kill them when the account credits are finished, is dialog also the way to go for that)? * We would need to be able to receive rpc requests from a remote server. What do you recommend us as approach: using existing rpc modules and expose our own apis through that or fire up our own rpc server instead? Thanks in advance for any tip! DanB