diff --git a/openbsc/src/libmsc/gsm_04_80.c b/openbsc/src/libmsc/gsm_04_80.c
index f1d75f2..1744455 100644
--- a/openbsc/src/libmsc/gsm_04_80.c
+++ b/openbsc/src/libmsc/gsm_04_80.c
@@ -63,7 +63,7 @@
 /* Send response to a mobile-originated ProcessUnstructuredSS-Request */
 int gsm0480_send_ussd_response(struct gsm_subscriber_connection *conn,
 			       const struct msgb *in_msg, const char *response_text,
-			       const struct ussd_request *req)
+			       const struct ss_request *req)
 {
 	struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 USSD RSP");
 	struct gsm48_hdr *gh;
@@ -111,7 +111,7 @@
 
 int gsm0480_send_ussd_reject(struct gsm_subscriber_connection *conn,
 			     const struct msgb *in_msg,
-			     const struct ussd_request *req)
+			     const struct ss_request *req)
 {
 	struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 USSD REJ");
 	struct gsm48_hdr *gh;
diff --git a/openbsc/src/libmsc/ussd.c b/openbsc/src/libmsc/ussd.c
index 7f01eae..f12c1f2 100644
--- a/openbsc/src/libmsc/ussd.c
+++ b/openbsc/src/libmsc/ussd.c
@@ -38,19 +38,19 @@
 const char USSD_TEXT_OWN_NUMBER[] = "*#100#";
 
 /* Forward declarations of network-specific handler functions */
-static int send_own_number(struct gsm_subscriber_connection *conn, const struct msgb *msg, const struct ussd_request *req);
+static int send_own_number(struct gsm_subscriber_connection *conn, const struct msgb *msg, const struct ss_request *req);
 
 
 /* Entrypoint - handler function common to all mobile-originated USSDs */
 int handle_rcv_ussd(struct gsm_subscriber_connection *conn, struct msgb *msg)
 {
 	int rc;
-	struct ussd_request req;
+	struct ss_request req;
 	struct gsm48_hdr *gh;
 
 	memset(&req, 0, sizeof(req));
 	gh = msgb_l3(msg);
-	rc = gsm0480_decode_ussd_request(gh, msgb_l3len(msg), &req);
+	rc = gsm0480_decode_ss_request(gh, msgb_l3len(msg), &req);
 	if (!rc) {
 		DEBUGP(DMM, "Unhandled SS\n");
 		rc = gsm0480_send_ussd_reject(conn, msg, &req);
@@ -58,15 +58,23 @@
 		return rc;
 	}
 
-	/* Release-Complete */
-	if (req.text[0] == '\0')
+	/* Interrogation or releaseComplete? */
+	if (req.ussd_text[0] == '\0' || req.ussd_text[0] == 0xFF) {
+		if (req.ss_code > 0) {
+			/* Assume interrogateSS or modification of it and reject */
+			rc = gsm0480_send_ussd_reject(conn, msg, &req);
+			msc_release_connection(conn);
+			return rc;
+		}
+		/* Still assuming a Release-Complete and returning */
 		return 0;
+	}
 
-	if (!strcmp(USSD_TEXT_OWN_NUMBER, (const char *)req.text)) {
+	if (!strcmp(USSD_TEXT_OWN_NUMBER, (const char *)req.ussd_text)) {
 		DEBUGP(DMM, "USSD: Own number requested\n");
 		rc = send_own_number(conn, msg, &req);
 	} else {
-		DEBUGP(DMM, "Unhandled USSD %s\n", req.text);
+		DEBUGP(DMM, "Unhandled USSD %s\n", req.ussd_text);
 		rc = gsm0480_send_ussd_reject(conn, msg, &req);
 	}
 
@@ -76,7 +84,7 @@
 }
 
 /* A network-specific handler function */
-static int send_own_number(struct gsm_subscriber_connection *conn, const struct msgb *msg, const struct ussd_request *req)
+static int send_own_number(struct gsm_subscriber_connection *conn, const struct msgb *msg, const struct ss_request *req)
 {
 	char *own_number = conn->subscr->extension;
 	char response_string[GSM_EXTENSION_LENGTH + 20];