diff --git a/openbsc/src/libmgcp/mgcp_protocol.c b/openbsc/src/libmgcp/mgcp_protocol.c
index 98452ce..5df3577 100644
--- a/openbsc/src/libmgcp/mgcp_protocol.c
+++ b/openbsc/src/libmgcp/mgcp_protocol.c
@@ -258,6 +258,7 @@
 	len = snprintf(sdp_record, size,
 			"v=0\r\n"
 			"o=- %u 23 IN IP4 %s\r\n"
+			"s=-\r\n"
 			"c=IN IP4 %s\r\n"
 			"t=0 0\r\n",
 			endp->ci, addr, addr);