diff --git a/radio/1.4/vts/functional/radio_hidl_hal_api.cpp b/radio/1.4/vts/functional/radio_hidl_hal_api.cpp
index 696c746..26f2c90 100644
--- a/radio/1.4/vts/functional/radio_hidl_hal_api.cpp
+++ b/radio/1.4/vts/functional/radio_hidl_hal_api.cpp
@@ -41,6 +41,12 @@
 
     ALOGI("emergencyDial, rspInfo.error = %s\n", toString(radioRsp_v1_4->rspInfo.error).c_str());
     EXPECT_EQ(RadioError::NONE, radioRsp_v1_4->rspInfo.error);
+
+    // Give some time for modem to establish the emergency call channel.
+    sleep(MODEM_EMERGENCY_CALL_ESTABLISH_TIME);
+
+    // Disconnect all the potential established calls to prevent them affecting other tests.
+    clearPotentialEstablishedCalls();
 }
 
 /*
@@ -67,6 +73,12 @@
     ALOGI("emergencyDial_withServices, rspInfo.error = %s\n",
           toString(radioRsp_v1_4->rspInfo.error).c_str());
     EXPECT_EQ(RadioError::NONE, radioRsp_v1_4->rspInfo.error);
+
+    // Give some time for modem to establish the emergency call channel.
+    sleep(MODEM_EMERGENCY_CALL_ESTABLISH_TIME);
+
+    // Disconnect all the potential established calls to prevent them affecting other tests.
+    clearPotentialEstablishedCalls();
 }
 
 /*
@@ -93,6 +105,12 @@
     ALOGI("emergencyDial_withEmergencyRouting, rspInfo.error = %s\n",
           toString(radioRsp_v1_4->rspInfo.error).c_str());
     EXPECT_EQ(RadioError::NONE, radioRsp_v1_4->rspInfo.error);
+
+    // Give some time for modem to establish the emergency call channel.
+    sleep(MODEM_EMERGENCY_CALL_ESTABLISH_TIME);
+
+    // Disconnect all the potential established calls to prevent them affecting other tests.
+    clearPotentialEstablishedCalls();
 }
 
 /*
diff --git a/radio/1.4/vts/functional/radio_hidl_hal_test.cpp b/radio/1.4/vts/functional/radio_hidl_hal_test.cpp
index d2d21ce..63e5f6e 100644
--- a/radio/1.4/vts/functional/radio_hidl_hal_test.cpp
+++ b/radio/1.4/vts/functional/radio_hidl_hal_test.cpp
@@ -87,6 +87,23 @@
     return status;
 }
 
+void RadioHidlTest_v1_4::clearPotentialEstablishedCalls() {
+    // Get the current call Id to hangup the established emergency call.
+    serial = GetRandomSerialNumber();
+    radio_v1_4->getCurrentCalls(serial);
+    EXPECT_EQ(std::cv_status::no_timeout, wait());
+
+    // Hang up to disconnect the established call channels.
+    for (const ::android::hardware::radio::V1_2::Call& call : radioRsp_v1_4->currentCalls) {
+        serial = GetRandomSerialNumber();
+        radio_v1_4->hangup(serial, call.base.index);
+        ALOGI("Hang up to disconnect the established call channel: %d", call.base.index);
+        EXPECT_EQ(std::cv_status::no_timeout, wait());
+        // Give some time for modem to disconnect the established call channel.
+        sleep(MODEM_EMERGENCY_CALL_DISCONNECT_TIME);
+    }
+}
+
 void RadioHidlTest_v1_4::updateSimCardStatus() {
     serial = GetRandomSerialNumber();
     radio_v1_4->getIccCardStatus(serial);
diff --git a/radio/1.4/vts/functional/radio_hidl_hal_utils_v1_4.h b/radio/1.4/vts/functional/radio_hidl_hal_utils_v1_4.h
index f662472..b07f9c3 100644
--- a/radio/1.4/vts/functional/radio_hidl_hal_utils_v1_4.h
+++ b/radio/1.4/vts/functional/radio_hidl_hal_utils_v1_4.h
@@ -44,6 +44,9 @@
 using ::android::hardware::Void;
 
 #define TIMEOUT_PERIOD 75
+#define MODEM_EMERGENCY_CALL_ESTABLISH_TIME 3
+#define MODEM_EMERGENCY_CALL_DISCONNECT_TIME 3
+
 #define RADIO_SERVICE_NAME "slot1"
 
 class RadioHidlTest_v1_4;
@@ -59,6 +62,9 @@
 
     RadioResponseInfo rspInfo;
 
+    // Call
+    hidl_vec<::android::hardware::radio::V1_2::Call> currentCalls;
+
     // Modem
     bool isModemEnabled;
     bool enableModemResponseToggle;
@@ -725,6 +731,9 @@
     /* Serial number for radio request */
     int serial;
 
+    /* Clear Potential Established Calls */
+    void clearPotentialEstablishedCalls();
+
     /* Update Sim Card Status */
     void updateSimCardStatus();
 
diff --git a/radio/1.4/vts/functional/radio_response.cpp b/radio/1.4/vts/functional/radio_response.cpp
index eac0c68..a849926 100644
--- a/radio/1.4/vts/functional/radio_response.cpp
+++ b/radio/1.4/vts/functional/radio_response.cpp
@@ -77,7 +77,9 @@
     return Void();
 }
 
-Return<void> RadioResponse_v1_4::hangupConnectionResponse(const RadioResponseInfo& /*info*/) {
+Return<void> RadioResponse_v1_4::hangupConnectionResponse(const RadioResponseInfo& info) {
+    rspInfo = info;
+    parent_v1_4.notify(info.serial);
     return Void();
 }
 
@@ -729,9 +731,10 @@
 
 Return<void> RadioResponse_v1_4::getCurrentCallsResponse_1_2(
         const RadioResponseInfo& info,
-        const ::android::hardware::hidl_vec<::android::hardware::radio::V1_2::Call>& /*calls*/) {
+        const ::android::hardware::hidl_vec<::android::hardware::radio::V1_2::Call>& calls) {
     rspInfo = info;
     parent_v1_4.notify(info.serial);
+    currentCalls = calls;
     return Void();
 }