diff --git a/include/openbsc/gsm_data.h b/include/openbsc/gsm_data.h
index 2048abc..25da171 100644
--- a/include/openbsc/gsm_data.h
+++ b/include/openbsc/gsm_data.h
@@ -17,6 +17,12 @@
 
 enum gsm_hooks {
 	GSM_HOOK_NM_SWLOAD,
+	GSM_HOOK_RR_PAGING,
+};
+
+enum gsm_paging_event {
+	GSM_PAGING_SUCCEEDED,
+	GSM_PAGING_EXPIRED,
 };
 
 struct msgb;
@@ -63,6 +69,8 @@
 
 	/* the 'local' subscriber */
 	struct gsm_subscriber *subscr;
+	/* the 'remote' subscriber */
+	struct gsm_subscriber *called_subscr;
 };
 
 
@@ -212,13 +220,22 @@
  * A pending paging request 
  */
 struct gsm_paging_request {
+	/* list_head for list of all paging requests */
 	struct llist_head entry;
+	/* the subscriber which we're paging. Later gsm_paging_request
+	 * should probably become a part of the gsm_subscriber struct? */
 	struct gsm_subscriber *subscr;
+	/* back-pointer to the BTS on which we are paging */
 	struct gsm_bts *bts;
+	/* what kind of channel type do we ask the MS to establish */
 	int chan_type;
 
 	/* Timer 3113: how long do we try to page? */
 	struct timer_list T3113;
+
+	/* callback to be called in case paging completes */
+	gsm_cbfn *cbfn;
+	void *cbfn_param;
 };
 #define T3113_VALUE	60, 0