Tutorial: Placing and receiving calls with liblinphone

# Initialize liblinphone

The first thing to do is to initialize the library passing it a set of callbacks functions to receive various notifications: incoming calls, progress of calls etc... These callbacks are all grouped in the LinphoneCoreVTable structure. All are optionnals (use NULL if you don't need them). The following code shows how initialize liblinphone:

            ##include <linphonecore.h>

            //callback function for notification of incoming calls
            static void on_invite_recv(LinphoneCore *lc, const char *from){
                    printf("Receiving a call from %s\n",from);
            }

            //callback function for notification end of calls (by remote)
            static void on_bye_recv(LinphoneCore *lc, const char *from){
                    printf("Remote end hangup\n");
            }

            /
            static void on_display_status(LinphoneCore *lc, const char *msg){
                    printf("%s",msg);
            }

            int main(int argc, char *argv[]){
                    LinphoneCoreVTable vtable;

                    memset(&vtable,0,sizeof(vtable));
                    vtable.inv_recv=
                    vtable.bye_recv=
                    vtable.display_status=

            }

/**