diff --git a/radio/1.3/Android.bp b/radio/1.3/Android.bp
index 5ac38cd..9424a85 100644
--- a/radio/1.3/Android.bp
+++ b/radio/1.3/Android.bp
@@ -22,6 +22,7 @@
         "AccessNetwork",
         "DataRegStateResult",
         "EmergencyNumber",
+        "EmergencyNumberSource",
         "EmergencyServiceCategory",
         "LteVopsInfo",
     ],
diff --git a/radio/1.3/IRadio.hal b/radio/1.3/IRadio.hal
index 480a61f..2b14488 100644
--- a/radio/1.3/IRadio.hal
+++ b/radio/1.3/IRadio.hal
@@ -86,36 +86,19 @@
             bool isRoaming, DataRequestReason reason, vec<string> addresses, vec<string> dnses);
 
     /**
-     * Request the current emergency number list.
-     *
-     * Each emergency number (@1.3::EmergencyNumber) in the emergency number list contains a
-     * dialing number, one or more service category(s), and mobile country code.
-     *
-     * Radio must collect all sources of the emergency number to build the response.
-     * For example, network operator signals, sim card information, modem configuration, OEM
-     * configuration (for example, OEM system properties), always-available emergency numbers and
-     * sim-absence emergency numbers, etc.
-     *
-     * 112, 911 are always available. Besides, 000, 08, 110, 999, 118 and 119 should be available
-     * when sim is not present.
-     *
-     * Please refer the document of @1.3::EmergencyNumber to construct each emergency number to be
-     * returned.
-     *
-     * Reference: 3GPP TS 22.101 version 9.1.0 Release 9
-     *
-     * @param serial Serial number of request.
-     *
-     * Response function is IRadioResponse.getCurrentEmergencyNumberListResponse()
-     */
-    oneway getCurrentEmergencyNumberList(int32_t serial);
-
-    /**
-     * Initiate emergency voice call, with one or more emergency service category(s).
+     * Initiate emergency voice call, with zero or more emergency service category(s).
      *
      * Note this API is the same as IRadio.dial except using the
      * @1.3::EmergencyServiceCategory as the input param.
      *
+     * If the dialed emergency number does not have a specified emergency service category, the
+     * 'categories' field is set to @1.3::EmergencyServiceCategory#UNSPECIFIED; iff either the
+     * 'categories' field is set to @1.3::EmergencyServiceCategory#UNSPECIFIED or the underlying
+     * technology used to request emergency services does not support the emergency service
+     * category, the interpretation of the categories is defined by implementation.
+     *
+     * Reference: 3gpp TS 22.101, Section 10 - Emergency Calls
+     *
      * @param serial Serial number of request.
      * @param dialInfo the same @1.0::Dial information used by @1.0::IRadio.dial.
      * @param categories bitfield<@1.3::EmergencyServiceCategory> the Emergency Service Category(s)
diff --git a/radio/1.3/IRadioIndication.hal b/radio/1.3/IRadioIndication.hal
index c80e762..509eef8 100644
--- a/radio/1.3/IRadioIndication.hal
+++ b/radio/1.3/IRadioIndication.hal
@@ -24,29 +24,28 @@
  */
 interface IRadioIndication extends @1.2::IRadioIndication {
     /**
-     * Indicate and update all of the current Emergency Number information known to the radio,
-     * when any of the Emergency Number sources (For example, network operator signals, sim card
-     * information, modem configuration, OEM configuration or system properties, etc.) change the
-     * list of emergency numbers.
+     * Report the current list of emergency numbers
      *
-     * 112, 911 are always available. Besides, 000, 08, 110, 999, 118 and 119 should be available
-     * when sim is not present.
+     * Each emergency number (@1.3::EmergencyNumber) in the emergency number list contains a
+     * dialing number, zero or more service category(s), mobile country code, and source(s) that
+     * indicate where it comes from.
      *
-     * This should be the same information as returned by getCurrentEmergencyNumberList() in
-     * 1.3::IRadio.
+     * Radio must report all the valid emergency numbers with known mobile country code and
+     * emergency service categories from all available sources including network signaling, sim,
+     * modem/oem configuration, and default configuration (112 and 911 must be always available;
+     * additionally, 000, 08, 110, 999, 118 and 119 must be available when sim is not present).
+     * Radio shall not report emergency numbers that are invalid in the current locale. The
+     * reported emergency number list must not have duplicate @1.3::EmergencyNumber entries. Please
+     * refer the documentation of @1.3::EmergencyNumber to construct each emergency number to
+     * report.
      *
-     * The indicated list of emergency numbers should not have duplicate @1.3::EmergencyNumber.
-     * Please refer the document of @1.3::EmergencyNumber to construct each emergency number to be
-     * returned.
+     * Radio must report the complete list of emergency numbers whenever the emergency numbers in
+     * the list are changed or whenever the client and the radio server are connected.
      *
-     * Reference: 3GPP TS 22.101 version 9.1.0 Release 9
+     * Reference: 3gpp 22.101, Section 10 - Emergency Calls
      *
      * @param type Type of radio indication
-     * @param emergencyNumberList List of current Emergency Number information
-     *     (@1.3::EmergencyNumber) known to radio. Radio must collect all sources of the emergency
-     *     numbers to build the indication. For example, network operator signals, sim card
-     *     information, modem configuration, OEM configuration (for example, OEM specific system
-     *     properties), always-available emergency numbers and sim-absence emergency numbers, etc.
+     * @param emergencyNumberList Current list of emergency numbers known to radio.
      */
     oneway currentEmergencyNumberList(RadioIndicationType type,
             vec<EmergencyNumber> emergencyNumberList);
diff --git a/radio/1.3/IRadioResponse.hal b/radio/1.3/IRadioResponse.hal
index 3604953..10e7d63 100644
--- a/radio/1.3/IRadioResponse.hal
+++ b/radio/1.3/IRadioResponse.hal
@@ -25,30 +25,6 @@
 interface IRadioResponse extends @1.2::IRadioResponse {
     /**
      * @param info Response info struct containing response type, serial no. and error
-     * @param emergencyNumberList List of current Emergency Number information known to radio.
-     *
-     * Radio must collect all sources of the emergency number to build the response. For example,
-     * network operator signals, sim card information, modem configuration, OEM configuration (for
-     * example, OEM system properties), always-available emergency numbers and sim-absence
-     * emergency numbers, etc.
-     *
-     * The returned list of emergency numbers must not have duplicate @1.3::EmergencyNumber. Please
-     * refer the document of @1.3::EmergencyNumber to construct each emergency number to be
-     * returned.
-     *
-     * Reference: 3GPP TS 22.101 version 9.1.0 Release 9
-     *
-     * Valid errors returned:
-     *   RadioError:NONE
-     *   RadioError:RADIO_NOT_AVAILABLE
-     *   RadioError:NO_MEMORY
-     *   RadioError:MODEM_ERR
-     */
-    oneway getCurrentEmergencyNumberListResponse(RadioResponseInfo info,
-            vec<EmergencyNumber> emergencyNumberList);
-
-    /**
-     * @param info Response info struct containing response type, serial no. and error
      *
      * Valid errors returned:
      *   RadioError:NONE
diff --git a/radio/1.3/types.hal b/radio/1.3/types.hal
index d472ca7..09202a5 100644
--- a/radio/1.3/types.hal
+++ b/radio/1.3/types.hal
@@ -29,14 +29,14 @@
 };
 
 /**
- * Emergency number contains information of number, one or more service category(s), and mobile
- * country code (mcc).
+ * Emergency number contains information of number, one or more service category(s), mobile country
+ * code (mcc), and source(s) that indicate where it comes from.
  *
  * If the source of the emergency number is associated with country, field ‘mcc’ must be
  * provided; otherwise the field ‘mcc’ must be an empty string.
  *
- * A unique EmergencyNumber has a unique combination of ‘number’ and ‘mcc’ fields.
- * Multiple @1.3::EmergencyServiceCategory should be merged into the bitfield for the same
+ * A unique EmergencyNumber has a unique combination of ‘number’, ‘mcc’ and 'categories' fields.
+ * Multiple @1.3::EmergencyNumberSource should be merged into the bitfield for the same
  * EmergencyNumber.
  *
  * Reference: 3GPP TS 22.101 version 9.1.0 Release 9
@@ -56,6 +56,11 @@
      * the value of each bit.
      */
     bitfield<EmergencyServiceCategory> categories;
+    /**
+     * The bitfield of @1.3::EmergencyNumberSource(s). See @1.3::EmergencyNumberSource for the
+     * value of each bit.
+     */
+    bitfield<EmergencyNumberSource> sources;
 };
 
 /**
@@ -69,20 +74,55 @@
  * - Manually Initiated eCall (MIeC);
  * - Automatically Initiated eCall (AIeC);
  *
- * Type GENERIC (General emergency call, all categories) is considered to use if the reported type
- * is not any of the other specific types.
+ * Category UNSPECIFIED (General emergency call, all categories) indicates that no specific
+ * services are associated with this emergency number.
  *
- * Reference: 3GPP TS 22.101 version 9.1.0 Release 9
+ * Reference: 3gpp 22.101, Section 10 - Emergency Calls
  */
 enum EmergencyServiceCategory : int32_t {
-    GENERIC = 0, // General emergency call, all categories
+    /**
+     * General emergency call, all categories
+     */
+    UNSPECIFIED = 0,
     POLICE = 1 << 0,
     AMBULANCE = 1 << 1,
     FIRE_BRIGADE = 1 << 2,
     MARINE_GUARD = 1 << 3,
     MOUNTAIN_RESCUE = 1 << 4,
-    MIEC = 1 << 5, // Manually Initiated eCall (MIeC)
-    AIEC = 1 << 6, // Automatically Initiated eCall (AIeC)
+    /**
+     * Manually Initiated eCall (MIeC)
+     */
+    MIEC = 1 << 5,
+    /**
+     * Automatically Initiated eCall (AIeC)
+     */
+    AIEC = 1 << 6,
+};
+
+/**
+ * The source to tell where the corresponding @1.3::EmergencyNumber comes from.
+ *
+ * Reference: 3gpp 22.101, Section 10 - Emergency Calls
+ */
+enum EmergencyNumberSource : int32_t {
+    /**
+     * Indicates the number is from the network signal.
+     */
+    NETWORK_SIGNALING = 1 << 0,
+    /**
+     * Indicates the number is from the sim card.
+     */
+    SIM = 1 << 1,
+    /**
+     * Indicates the number is from the modem config.
+     */
+    MODEM_CONFIG = 1 << 2,
+    /**
+     * Indicates the number is available as default. Per the reference, 112, 911 must always be
+     * available; additionally, 000, 08, 110, 999, 118 and 119 must be available when sim is not
+     * present.
+     */
+    DEFAULT = 1 << 3,
 };
 
 /**