diff --git a/radio/1.4/IRadio.hal b/radio/1.4/IRadio.hal
index ba0dafa235..3f4b1a5d1a 100644
--- a/radio/1.4/IRadio.hal
+++ b/radio/1.4/IRadio.hal
@@ -126,6 +126,9 @@ interface IRadio extends @1.3::IRadio {
      * does not support the emergency service category or emergency uniform resource names, the
      * field 'categories' or 'urns' may be ignored.
      *
+     * If 'isTesting' is true, this request is for testing purpose, and must not be sent to a real
+     * emergency service; otherwise it's for a real emergency call request.
+     *
      * Reference: 3gpp 22.101, Section 10 - Emergency Calls;
      *            3gpp 23.167, Section 6 - Functional description;
      *            3gpp 24.503, Section 5.1.6.8.1 - General;
@@ -142,7 +145,7 @@ interface IRadio extends @1.3::IRadio {
      */
     oneway emergencyDial(int32_t serial, Dial dialInfo,
             bitfield<EmergencyServiceCategory> categories, vec<string> urns,
-            EmergencyCallRouting routing);
+            EmergencyCallRouting routing, bool isTesting);
 
     /**
      * Starts a network scan