gbproxy: Enable IP-SNS towards SGSN

Change-Id: Ia9cb646d57cd3bf77aebf60318e5f76599d516a5
diff --git a/gbproxy/GBProxy_Tests.fr.cfg b/gbproxy/GBProxy_Tests.fr.cfg
index d316fe5..234b2f4 100644
--- a/gbproxy/GBProxy_Tests.fr.cfg
+++ b/gbproxy/GBProxy_Tests.fr.cfg
@@ -14,6 +14,12 @@
 [MODULE_PARAMETERS]
 GBProxy_Tests.mp_enable_bss_load_sharing := true;
 
+GBProxy_Tests.mp_nsconfig_sgsn := {
+	{
+		handle_sns := true
+	}
+}
+
 GBProxy_Tests.mp_nsconfig_pcu := {
 	{
 		nsei := 2001,