diff --git a/libs/freetdm/src/include/private/ftdm_types.h b/libs/freetdm/src/include/private/ftdm_types.h
index 92491135b6..1b56859d3e 100644
--- a/libs/freetdm/src/include/private/ftdm_types.h
+++ b/libs/freetdm/src/include/private/ftdm_types.h
@@ -162,7 +162,8 @@ typedef enum {
 	FTDM_SIGTYPE_ANALOG,
 	FTDM_SIGTYPE_SANGOMABOOST,
 	FTDM_SIGTYPE_M3UA,
-	FTDM_SIGTYPE_R2
+	FTDM_SIGTYPE_R2,
+	FTDM_SIGTYPE_SANGOMASS7
 } ftdm_signal_type_t;
 
 typedef enum {