diff --git a/proto/telecom.proto b/proto/telecom.proto
index 73eba87..411b8e2 100644
--- a/proto/telecom.proto
+++ b/proto/telecom.proto
@@ -177,6 +177,13 @@
 
   // The type of the in-call service
   optional InCallServiceType in_call_service_type = 2;
+
+  // The number of milliseconds that the in call service remained bound between binding and
+  // disconnection.
+  optional int64 bound_duration_millis = 3;
+
+  // True if the in call service has ever crashed during a call.
+  optional bool is_null_binding = 4;
 }
 
 // Information about each call.