diff --git a/src/com/android/phone/ImsRcsController.java b/src/com/android/phone/ImsRcsController.java
index 122386d..fd61936 100644
--- a/src/com/android/phone/ImsRcsController.java
+++ b/src/com/android/phone/ImsRcsController.java
@@ -42,6 +42,7 @@
 import com.android.internal.telephony.ims.ImsResolver;
 import com.android.internal.telephony.imsphone.ImsPhone;
 import com.android.services.telephony.rcs.RcsFeatureController;
+import com.android.services.telephony.rcs.SipTransportController;
 import com.android.services.telephony.rcs.TelephonyRcsService;
 import com.android.services.telephony.rcs.UserCapabilityExchangeImpl;
 
@@ -353,6 +354,29 @@
         }
     }
 
+    @Override
+    public boolean isSipDelegateSupported(int subId) {
+        enforceReadPrivilegedPermission("isSipDelegateSupported");
+        final long token = Binder.clearCallingIdentity();
+        try {
+            SipTransportController transport = getRcsFeatureController(subId).getFeature(
+                    SipTransportController.class);
+            if (transport == null) {
+                return false;
+            }
+            return transport.isSupported(subId);
+        } catch (ImsException e) {
+            throw new ServiceSpecificException(e.getCode(), e.getMessage());
+        } catch (ServiceSpecificException e) {
+            if (e.errorCode == ImsException.CODE_ERROR_UNSUPPORTED_OPERATION) {
+                return false;
+            }
+            throw e;
+        } finally {
+            Binder.restoreCallingIdentity(token);
+        }
+    }
+
     /**
      * Registers for updates to the RcsFeature connection through the IImsServiceFeatureCallback
      * callback.
diff --git a/src/com/android/services/telephony/rcs/SipTransportController.java b/src/com/android/services/telephony/rcs/SipTransportController.java
new file mode 100644
index 0000000..da5374a
--- /dev/null
+++ b/src/com/android/services/telephony/rcs/SipTransportController.java
@@ -0,0 +1,195 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.services.telephony.rcs;
+
+import android.content.Context;
+import android.telephony.ims.ImsException;
+import android.telephony.ims.ImsService;
+import android.util.Log;
+
+import com.android.ims.RcsFeatureManager;
+import com.android.internal.annotations.VisibleForTesting;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.concurrent.ScheduledExecutorService;
+
+/**
+ * Manages the creation and destruction of SipDelegates in response to an IMS application requesting
+ * a SipDelegateConnection registered to one or more IMS feature tags.
+ * <p>
+ * This allows an IMS application to forward traffic related to those feature tags over the existing
+ * IMS registration managed by the {@link ImsService} associated with this cellular subscription
+ * instead of requiring that the IMS application manage its own IMS registration over-the-top. This
+ * is required for some cellular carriers, which mandate that all IMS SIP traffic must be sent
+ * through a single IMS registration managed by the system IMS service.
+ */
+public class SipTransportController implements RcsFeatureController.Feature {
+    private static final String LOG_TAG = "SipTransportC";
+
+    private final Context mContext;
+    private final int mSlotId;
+    private final ScheduledExecutorService mExecutorService;
+
+    private int mSubId;
+    private RcsFeatureManager mRcsManager;
+
+    /**
+     * Create an instance of SipTransportController.
+     * @param context The Context associated with this controller.
+     * @param slotId The slot index associated with this controller.
+     * @param subId The subscription ID associated with this controller when it was first created.
+     */
+    public SipTransportController(Context context, int slotId, int subId) {
+        mContext = context;
+        mSlotId = slotId;
+        mSubId = subId;
+
+        mExecutorService = Executors.newSingleThreadScheduledExecutor();
+    }
+
+    /**
+     * Constructor to inject dependencies for testing.
+     */
+    @VisibleForTesting
+    public SipTransportController(Context context, int slotId, int subId,
+            ScheduledExecutorService executor) {
+        mContext = context;
+        mSlotId = slotId;
+        mSubId = subId;
+
+        mExecutorService = executor;
+        logi("created");
+    }
+
+    @Override
+    public void onRcsConnected(RcsFeatureManager manager) {
+        mExecutorService.submit(() -> onRcsManagerChanged(manager));
+    }
+
+    @Override
+    public void onRcsDisconnected() {
+        mExecutorService.submit(() -> onRcsManagerChanged(null));
+    }
+
+    @Override
+    public void onAssociatedSubscriptionUpdated(int subId) {
+        mExecutorService.submit(()-> onSubIdChanged(subId));
+    }
+
+    @Override
+    public void onDestroy() {
+        // Can be null in testing.
+        mExecutorService.shutdownNow();
+    }
+
+    /**
+     * @return Whether or not SipTransports are supported on the connected ImsService. This can
+     * change based on the capabilities of the ImsService.
+     * @throws ImsException if the ImsService connected to this controller is currently down.
+     */
+    public boolean isSupported(int subId) throws ImsException {
+        Boolean result = waitForMethodToComplete(() -> isSupportedInternal(subId));
+        if (result == null) {
+            logw("isSupported, unexpected null result, returning false");
+            return false;
+        }
+        return result;
+    }
+
+    /**
+     * Returns whether or not the ImsService implementation associated with the supplied subId
+     * supports the SipTransport APIs.
+     * <p>
+     * This should only be called on the ExecutorService.
+     * @return true if SipTransport is supported on this subscription, false otherwise.
+     * @throws ImsException thrown if there was an error determining the state of the ImsService.
+     */
+    private boolean isSupportedInternal(int subId) throws ImsException {
+        checkStateOfController(subId);
+        return (mRcsManager.getSipTransport() != null);
+    }
+
+    /**
+     * Run a Callable on the ExecutorService Thread and wait for the result.
+     * If an ImsException is thrown, catch it and rethrow it to caller.
+     */
+    private <T> T waitForMethodToComplete(Callable<T> callable) throws ImsException {
+        Future<T> r = mExecutorService.submit(callable);
+        T result;
+        try {
+            result = r.get();
+        } catch (InterruptedException e) {
+            result = null;
+        } catch (ExecutionException e) {
+            Throwable cause = e.getCause();
+            if (cause instanceof ImsException) {
+                // Rethrow the exception
+                throw (ImsException) cause;
+            }
+            logw("Unexpected Exception, returning null: " + cause);
+            result = null;
+        }
+        return result;
+    }
+
+    /**
+     * Throw an ImsException for common scenarios where the state of the controller is not ready
+     * for communication.
+     * <p>
+     * This should only be called while running on the on the ExecutorService.
+     */
+    private void checkStateOfController(int subId) throws ImsException {
+        if (mSubId != subId) {
+            // sub ID has changed while this was in the queue.
+            throw new ImsException("subId is no longer valid for this request.",
+                    ImsException.CODE_ERROR_INVALID_SUBSCRIPTION);
+        }
+        if (mRcsManager == null) {
+            throw new ImsException("Connection to ImsService is not available",
+                    ImsException.CODE_ERROR_SERVICE_UNAVAILABLE);
+        }
+    }
+
+    private void onRcsManagerChanged(RcsFeatureManager m) {
+        logi("manager changed, " + mRcsManager + "->" + m);
+        mRcsManager = m;
+    }
+
+    /**
+     * Called when either the sub ID associated with the slot has changed or the carrier
+     * configuration associated with the same subId has changed.
+     */
+    private void onSubIdChanged(int newSubId) {
+        logi("subId changed, " + mSubId + "->" + newSubId);
+        mSubId = newSubId;
+    }
+
+    private void logi(String message) {
+        Log.i(LOG_TAG, getPrefix() + ": " + message);
+    }
+
+    private void logw(String message) {
+        Log.w(LOG_TAG, getPrefix() + ": " + message);
+    }
+
+    private String getPrefix() {
+        return "[" + mSlotId + "," + mSubId + "]";
+    }
+}
diff --git a/src/com/android/services/telephony/rcs/TelephonyRcsService.java b/src/com/android/services/telephony/rcs/TelephonyRcsService.java
index 69d8f82..79170af 100644
--- a/src/com/android/services/telephony/rcs/TelephonyRcsService.java
+++ b/src/com/android/services/telephony/rcs/TelephonyRcsService.java
@@ -62,6 +62,12 @@
          */
         UserCapabilityExchangeImpl createUserCapabilityExchange(Context context, int slotId,
                 int subId);
+
+        /**
+         * @return an instance of {@link SipTransportController} for the slot and subscription
+         * specified.
+         */
+        SipTransportController createSipTransportController(Context context, int slotId, int subId);
     }
 
     private FeatureFactory mFeatureFactory = new FeatureFactory() {
@@ -75,6 +81,12 @@
                 int subId) {
             return new UserCapabilityExchangeImpl(context, slotId, subId);
         }
+
+        @Override
+        public SipTransportController createSipTransportController(Context context, int slotId,
+                int subId) {
+            return new SipTransportController(context, slotId, subId);
+        }
     };
 
     // Notifies this service that there has been a change in available slots.
@@ -234,6 +246,17 @@
                 c.removeFeature(UserCapabilityExchangeImpl.class);
             }
         }
+
+        if (doesSubscriptionSupportSingleRegistration(subId)) {
+            if (c.getFeature(SipTransportController.class) == null) {
+                c.addFeature(mFeatureFactory.createSipTransportController(mContext, slotId, subId),
+                        SipTransportController.class);
+            }
+        } else {
+            if (c.getFeature(SipTransportController.class) != null) {
+                c.removeFeature(SipTransportController.class);
+            }
+        }
         // Only start the connection procedure if we have active features.
         if (c.hasActiveFeatures()) c.connect();
     }
@@ -250,6 +273,14 @@
         return supportsUce;
     }
 
+    private boolean doesSubscriptionSupportSingleRegistration(int subId) {
+        if (!SubscriptionManager.isValidSubscriptionId(subId)) return false;
+        CarrierConfigManager carrierConfigManager =
+                mContext.getSystemService(CarrierConfigManager.class);
+        if (carrierConfigManager == null) return false;
+        return carrierConfigManager.getConfigForSubId(subId).getBoolean(
+                CarrierConfigManager.Ims.KEY_IMS_SINGLE_REGISTRATION_REQUIRED_BOOL);
+    }
 
     private int getSubscriptionFromSlot(int slotId) {
         SubscriptionManager manager = mContext.getSystemService(SubscriptionManager.class);