diff --git a/include/openbsc/abis_rsl.h b/include/openbsc/abis_rsl.h
index da9601a..420f3f4 100644
--- a/include/openbsc/abis_rsl.h
+++ b/include/openbsc/abis_rsl.h
@@ -373,6 +373,10 @@
 
 int abis_rsl_rcvmsg(struct msgb *msg);
 
+unsigned int get_paging_group(u_int64_t imsi, unsigned int bs_cc_chans,
+			      int n_pag_blocks);
+unsigned int n_pag_blocks(int bs_ccch_sdcch_comb, unsigned int bs_ag_blks_res);
+
 /* to be provided by external code */
 int abis_rsl_sendmsg(struct msgb *msg);
 int rsl_chan_release(struct gsm_lchan *lchan);