diff --git a/openbsc/src/gsm_data.c b/openbsc/src/gsm_data.c
index 5a51ac6..7ede318 100644
--- a/openbsc/src/gsm_data.c
+++ b/openbsc/src/gsm_data.c
@@ -318,6 +318,7 @@
 	net->msc_data->ping_timeout = 20;
 	net->msc_data->pong_timeout = 5;
 	net->msc_data->core_ncc = -1;
+	net->msc_data->rtp_payload = 126;
 
 	gsm_net_update_ctype(net);