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;
 }