diff --git a/openbsc/src/libbsc/chan_alloc.c b/openbsc/src/libbsc/chan_alloc.c
index 1e5dd74..c3a7e0f 100644
--- a/openbsc/src/libbsc/chan_alloc.c
+++ b/openbsc/src/libbsc/chan_alloc.c
@@ -309,8 +309,9 @@
 			if (lchan)
 				type = GSM_LCHAN_TCH_F;
 		}
+
 		/* Try fully dynamic TCH/F_TCH/H_PDCH as TCH/F... */
-		if (!lchan) {
+		if (!lchan && bts->network->dyn_ts_allow_tch_f) {
 			lchan = _lc_dyn_find_bts(bts,
 						 GSM_PCHAN_TCH_F_TCH_H_PDCH,
 						 GSM_PCHAN_TCH_F);
diff --git a/openbsc/src/libbsc/net_init.c b/openbsc/src/libbsc/net_init.c
index ee0d445..6d03ee4 100644
--- a/openbsc/src/libbsc/net_init.c
+++ b/openbsc/src/libbsc/net_init.c
@@ -116,6 +116,8 @@
 	net->ext_max = GSM_MAX_EXTEN;
 	gsm_net_update_ctype(net);
 
+	net->dyn_ts_allow_tch_f = true;
+
 	return net;
 }