diff --git a/telephony/java/com/android/ims/ImsCallProfile.java b/telephony/java/com/android/ims/ImsCallProfile.java
index f263b4d..861a379 100644
--- a/telephony/java/com/android/ims/ImsCallProfile.java
+++ b/telephony/java/com/android/ims/ImsCallProfile.java
@@ -178,6 +178,7 @@
      *  Codec: Codec info.
      *  DisplayText: Display text for the call.
      *  AdditionalCallInfo: Additional call info.
+     *  CallRadioTech: The radio tech on which the call is placed.
      */
     public static final String EXTRA_OI = "oi";
     public static final String EXTRA_CNA = "cna";
@@ -187,6 +188,7 @@
     public static final String EXTRA_CODEC = "Codec";
     public static final String EXTRA_DISPLAY_TEXT = "DisplayText";
     public static final String EXTRA_ADDITIONAL_CALL_INFO = "AdditionalCallInfo";
+    public static final String EXTRA_CALL_RAT_TYPE = "CallRadioTech";
 
     public int mServiceType;
     public int mCallType;