diff --git a/radio/aidl/aidl_api/android.hardware.radio.network/current/android/hardware/radio/network/SecurityAlgorithm.aidl b/radio/aidl/aidl_api/android.hardware.radio.network/current/android/hardware/radio/network/SecurityAlgorithm.aidl
index 3eb51e7..c590d2b 100644
--- a/radio/aidl/aidl_api/android.hardware.radio.network/current/android/hardware/radio/network/SecurityAlgorithm.aidl
+++ b/radio/aidl/aidl_api/android.hardware.radio.network/current/android/hardware/radio/network/SecurityAlgorithm.aidl
@@ -57,6 +57,7 @@
   NEA1 = 56,
   NEA2 = 57,
   NEA3 = 58,
+  IMS_NULL = 67,
   SIP_NULL = 68,
   AES_GCM = 69,
   AES_GMAC = 70,
@@ -64,9 +65,8 @@
   DES_EDE3_CBC = 72,
   AES_EDE3_CBC = 73,
   HMAC_SHA1_96 = 74,
-  HMAC_SHA1_96_NULL = 75,
-  HMAC_MD5_96 = 76,
-  HMAC_MD5_96_NULL = 77,
+  HMAC_MD5_96 = 75,
+  SRTP_NULL = 86,
   SRTP_AES_COUNTER = 87,
   SRTP_AES_F8 = 88,
   SRTP_HMAC_SHA1 = 89,
diff --git a/radio/aidl/android/hardware/radio/network/IRadioNetworkIndication.aidl b/radio/aidl/android/hardware/radio/network/IRadioNetworkIndication.aidl
index 875a1b2..da82b78 100644
--- a/radio/aidl/android/hardware/radio/network/IRadioNetworkIndication.aidl
+++ b/radio/aidl/android/hardware/radio/network/IRadioNetworkIndication.aidl
@@ -231,13 +231,12 @@
 
     /*
      * Indicates that a new ciphering or integrity algorithm was used for a particular voice,
-     * signaling, or data connection attempt for a given PLMN and/or access network. Due to
-     * power concerns, once a connection type has been reported on, follow-up reports about that
+     * signaling, or data connection for a given PLMN and/or access network. Due to power
+     * concerns, once a connection type has been reported on, follow-up reports about that
      * connection type are only generated if there is any change to the most-recently reported
      * encryption or integrity, or if the value of SecurityAlgorithmUpdate#isUnprotectedEmergency
-     * changes. Thus the AP is only to be notified when there is new information. A change only in
-     * cell ID should not trigger an update, as the design is intended to be agnostic to dual
-     * connectivity ("secondary serving cells").
+     * changes. A change only in cell ID should not trigger an update, as the design is intended
+     * to be agnostic to dual connectivity ("secondary serving cells").
      *
      * Sample scenario to further clarify "most-recently reported":
      *
@@ -246,9 +245,10 @@
      * 3. User returns to original location and reconnects to the null-ciphered 3G network. Modem
      *    should report this as it's different than the most-recently reported data from step (2).
      *
-     * List is reset upon rebooting thus info about initial connections is always passed to the AP
-     * after a reboot. List is also reset if the SIM is changed or if there has been a change in
-     * the access network.
+     * State is reset when (1) RadioState is transitioned to ON from any other state (e.g. radio
+     * is turned on during device boot, or modem boot), and (2) when CardState is transitioned
+     * to PRESENT from any other state (e.g. when SIM is inserted), or (3) if there is a change in
+     * access network (PLMN).
      *
      * @param type Type of radio indication
      * @param securityAlgorithmUpdate SecurityAlgorithmUpdate encapsulates details of security
diff --git a/radio/aidl/android/hardware/radio/network/SecurityAlgorithm.aidl b/radio/aidl/android/hardware/radio/network/SecurityAlgorithm.aidl
index fefa26e..19feeef 100644
--- a/radio/aidl/android/hardware/radio/network/SecurityAlgorithm.aidl
+++ b/radio/aidl/android/hardware/radio/network/SecurityAlgorithm.aidl
@@ -59,7 +59,8 @@
     NEA2 = 57,
     NEA3 = 58,
 
-    // SIP layer security (See 3GPP TS 33.203)
+    // IMS and SIP layer security (See 3GPP TS 33.203)
+    IMS_NULL = 67,
     SIP_NULL = 68,
     AES_GCM = 69,
     AES_GMAC = 70,
@@ -67,16 +68,15 @@
     DES_EDE3_CBC = 72,
     AES_EDE3_CBC = 73,
     HMAC_SHA1_96 = 74,
-    HMAC_SHA1_96_NULL = 75,
-    HMAC_MD5_96 = 76,
-    HMAC_MD5_96_NULL = 77,
+    HMAC_MD5_96 = 75,
 
     // RTP (see 3GPP TS 33.328)
+    SRTP_NULL = 86,
     SRTP_AES_COUNTER = 87,
     SRTP_AES_F8 = 88,
     SRTP_HMAC_SHA1 = 89,
 
-    // ePDG (3GPP TS 33.402)
+    // ePDG (3GPP TS 33.402) (reserved for future use)
     ENCR_AES_GCM_16 = 99,
     ENCR_AES_CBC = 100,
     AUTH_HMAC_SHA2_256_128 = 101,