diff --git a/radio/aidl/aidl_api/android.hardware.radio.ims.media/current/android/hardware/radio/ims/media/AnbrBitrate.aidl b/radio/aidl/aidl_api/android.hardware.radio.ims.media/current/android/hardware/radio/ims/media/AnbrBitrate.aidl
index 598d995..711ac19 100644
--- a/radio/aidl/aidl_api/android.hardware.radio.ims.media/current/android/hardware/radio/ims/media/AnbrBitrate.aidl
+++ b/radio/aidl/aidl_api/android.hardware.radio.ims.media/current/android/hardware/radio/ims/media/AnbrBitrate.aidl
@@ -34,7 +34,7 @@
 package android.hardware.radio.ims.media;
 @VintfStability
 parcelable AnbrBitrate {
-    const int INVALID_ANBR_BITRATE = -1;
-    int uplinkBps;
-    int downlinkBps;
-}
\ No newline at end of file
+  int uplinkBps;
+  int downlinkBps;
+  const int INVALID_ANBR_BITRATE = -1;
+}
diff --git a/radio/aidl/aidl_api/android.hardware.radio.ims.media/current/android/hardware/radio/ims/media/IImsMediaSession.aidl b/radio/aidl/aidl_api/android.hardware.radio.ims.media/current/android/hardware/radio/ims/media/IImsMediaSession.aidl
index 38d9d02..7fab555 100644
--- a/radio/aidl/aidl_api/android.hardware.radio.ims.media/current/android/hardware/radio/ims/media/IImsMediaSession.aidl
+++ b/radio/aidl/aidl_api/android.hardware.radio.ims.media/current/android/hardware/radio/ims/media/IImsMediaSession.aidl
@@ -40,6 +40,8 @@
   oneway void deleteConfig(in android.hardware.radio.ims.media.RtpConfig config);
   oneway void confirmConfig(in android.hardware.radio.ims.media.RtpConfig config);
   oneway void sendDtmf(char dtmfDigit, int duration);
+  oneway void startDtmf(char dtmfDigit);
+  oneway void stopDtmf();
   oneway void sendHeaderExtension(in List<android.hardware.radio.ims.media.RtpHeaderExtension> extensions);
   oneway void setMediaQualityThreshold(in android.hardware.radio.ims.media.MediaQualityThreshold threshold);
 }
diff --git a/radio/aidl/android/hardware/radio/ims/media/IImsMediaSession.aidl b/radio/aidl/android/hardware/radio/ims/media/IImsMediaSession.aidl
index 8c73bbc..d291f44 100644
--- a/radio/aidl/android/hardware/radio/ims/media/IImsMediaSession.aidl
+++ b/radio/aidl/android/hardware/radio/ims/media/IImsMediaSession.aidl
@@ -83,6 +83,21 @@
     void sendDtmf(char dtmfDigit, int duration);
 
     /**
+     * Start sending DTMF digit until the stopDtmf() API is received.
+     * If the implementation is currently sending a DTMF tone for which
+     * stopDtmf() is not received yet, then that digit must be stopped first
+     *
+     * @param dtmfDigit single char having one of 12 values: 0-9, *, #
+     */
+    void startDtmf(char dtmfDigit);
+
+    /**
+     * Stop sending the last DTMF digit started by startDtmf().
+     * stopDtmf() without preceding startDtmf() must be ignored.
+     */
+    void stopDtmf();
+
+    /**
      * Send RTP header extension to the other party in the next RTP packet.
      *
      * @param extensions data to be transmitted via RTP header extension