diff --git a/src/com/android/telecomm/CallsManager.java b/src/com/android/telecomm/CallsManager.java
index b21be69..bfeea49 100644
--- a/src/com/android/telecomm/CallsManager.java
+++ b/src/com/android/telecomm/CallsManager.java
@@ -605,8 +605,9 @@
         handoffCall.removeListener(this);
 
         if (wasSuccessful) {
-            // Disconnect.
-            originalCall.disconnect();
+            if (TelephonyUtil.isCurrentlyPSTNCall(originalCall)) {
+                originalCall.disconnect();
+            }
 
             // Synchronize.
             originalCall.setCallService(handoffCall.getCallService(), handoffCall);