rem: if (tmb.register_tmcb( ps->req, tmcb_types, tmcb_func, 0 )<=0) {
add: if (tmb.register_tmcb( 0, t, tmcb_types, tmcb_func, 0 )<=0) {
context: static void acc_onreq( struct cell* t, int type, struct tmcb_params *ps ){	int tmcb_types;	if (is_acc_on(ps->req) || is_mc_on(ps->req)) {		/* install addaitional handlers */		tmcb_types =			/* report on completed transactions */			TMCB_RESPONSE_OUT |			/* account e2e acks if configured to do so */			TMCB_E2EACK_IN |			/* report on missed calls */			TMCB_ON_FAILURE_RO |			/* get incoming replies ready for processing */			TMCB_RESPONSE_IN;		if (tmb.register_tmcb( ps->req, tmcb_types, tmcb_func, 0 )<=0) {			LOG(L_ERR,"ERROR:acc:acc_onreq: cannot register additional "				"callbacks\n");			return;		}		/* do some parsing in advance */		acc_preparse_req(ps->req);		/* also, if that is INVITE, disallow silent t-drop */		if (ps->req->REQ_METHOD==METHOD_INVITE) {			DBG("DEBUG: noisy_timer set for accounting\n");			t->noisy_ctimer=1;		}	}}