allow vty to set periodic location updating timer t3212
diff --git a/openbsc/src/bsc_hack.c b/openbsc/src/bsc_hack.c
index 4253959..347e951 100644
--- a/openbsc/src/bsc_hack.c
+++ b/openbsc/src/bsc_hack.c
@@ -1029,11 +1029,10 @@
 	}
 
 	/* Control Channel Description */
-	memset(&bts->chan_desc, 0, sizeof(struct gsm48_control_channel_descr));
 	bts->chan_desc.att = 1;
 	bts->chan_desc.ccch_conf = RSL_BCCH_CCCH_CONF_1_C;
 	bts->chan_desc.bs_pa_mfrms = RSL_BS_PA_MFRMS_5;
-	bts->chan_desc.t3212 = 0;
+	/* T3212 is set from vty/config */
 
 	paging_init(bts);