Handle failed supplmentary service notifications

Assign missing supplementary service failure strings

Change-Id: Ic42a6c2df146986fe3ff38126de087e776fef498
Bug: 79724128
diff --git a/src/com/android/phone/CallNotifier.java b/src/com/android/phone/CallNotifier.java
index ec670f5..ebef00d 100644
--- a/src/com/android/phone/CallNotifier.java
+++ b/src/com/android/phone/CallNotifier.java
@@ -563,13 +563,16 @@
                     R.string.incall_error_supp_service_separate);
         } else if (r.result == Phone.SuppService.SWITCH) {
             if (DBG) log("onSuppServiceFailed: displaying switch failure message");
-            mApplication.getResources().getString(
+            mergeFailedString = mApplication.getResources().getString(
                     R.string.incall_error_supp_service_switch);
         } else if (r.result == Phone.SuppService.REJECT) {
             if (DBG) log("onSuppServiceFailed: displaying reject failure message");
-            mApplication.getResources().getString(
+            mergeFailedString = mApplication.getResources().getString(
                     R.string.incall_error_supp_service_reject);
-        } else {
+        } else if (r.result == Phone.SuppService.HANGUP) {
+            mergeFailedString = mApplication.getResources().getString(
+                    R.string.incall_error_supp_service_hangup);
+        }  else {
             if (DBG) log("onSuppServiceFailed: unknown failure");
             return;
         }