diff --git a/openbsc/src/libcommon/gsm_data.c b/openbsc/src/libcommon/gsm_data.c
index 8b030e9..352700a 100644
--- a/openbsc/src/libcommon/gsm_data.c
+++ b/openbsc/src/libcommon/gsm_data.c
@@ -405,6 +405,9 @@
 	bts->si_common.rach_control.tx_integer = 9;  /* 12 slots spread - 217/115 slots delay */
 	bts->si_common.rach_control.max_trans = 3; /* 7 retransmissions */
 	bts->si_common.rach_control.t2 = 4; /* no emergency calls */
+	bts->si_common.chan_desc.att = 1; /* attachment required */
+	bts->si_common.chan_desc.bs_pa_mfrms = RSL_BS_PA_MFRMS_5; /* paging frames */
+	bts->si_common.chan_desc.bs_ag_blks_res = 1; /* reserved AGCH blocks */
 
 	llist_add_tail(&bts->list, &net->bts_list);