diff --git a/telephony/java/com/android/ims/ImsCallProfile.java b/telephony/java/com/android/ims/ImsCallProfile.java
index 65254d8abc884..36abfc9d288eb 100644
--- a/telephony/java/com/android/ims/ImsCallProfile.java
+++ b/telephony/java/com/android/ims/ImsCallProfile.java
@@ -205,6 +205,14 @@ public class ImsCallProfile implements Parcelable {
      */
     public static final String EXTRA_CALL_RAT_TYPE = "CallRadioTech";
 
+    /**
+     * Similar to {@link #EXTRA_CALL_RAT_TYPE}, except with a lowercase 'c'.  Used to ensure
+     * compatibility with modems that are non-compliant with the {@link #EXTRA_CALL_RAT_TYPE}
+     * extra key.  Should be removed when the non-compliant modems are fixed.
+     * @hide
+     */
+    public static final String EXTRA_CALL_RAT_TYPE_ALT = "callRadioTech";
+
     public int mServiceType;
     public int mCallType;
     public int mRestrictCause = CALL_RESTRICT_CAUSE_NONE;