diff --git a/native/cpp/CommonCpp/NativeModules/CommCoreModule.h b/native/cpp/CommonCpp/NativeModules/CommCoreModule.h
--- a/native/cpp/CommonCpp/NativeModules/CommCoreModule.h
+++ b/native/cpp/CommonCpp/NativeModules/CommCoreModule.h
@@ -80,6 +80,13 @@
       jsi::String oneTimeKeys) override;
   virtual jsi::Value
   isNotificationsSessionInitialized(jsi::Runtime &rt) override;
+  virtual jsi::Value initializeContentOutboundSession(
+      jsi::Runtime &rt,
+      jsi::String identityKeys,
+      jsi::String prekey,
+      jsi::String prekeySignature,
+      jsi::String oneTimeKeys,
+      jsi::String deviceID) override;
   virtual void terminate(jsi::Runtime &rt) override;
   virtual double getCodeVersion(jsi::Runtime &rt) override;
   virtual jsi::Value
diff --git a/native/cpp/CommonCpp/NativeModules/CommCoreModule.cpp b/native/cpp/CommonCpp/NativeModules/CommCoreModule.cpp
--- a/native/cpp/CommonCpp/NativeModules/CommCoreModule.cpp
+++ b/native/cpp/CommonCpp/NativeModules/CommCoreModule.cpp
@@ -718,6 +718,57 @@
       });
 }
 
+jsi::Value CommCoreModule::initializeContentOutboundSession(
+    jsi::Runtime &rt,
+    jsi::String identityKeys,
+    jsi::String prekey,
+    jsi::String prekeySignature,
+    jsi::String oneTimeKeys,
+    jsi::String deviceID) {
+  auto identityKeysCpp{identityKeys.utf8(rt)};
+  auto prekeyCpp{prekey.utf8(rt)};
+  auto prekeySignatureCpp{prekeySignature.utf8(rt)};
+  auto oneTimeKeysCpp{oneTimeKeys.utf8(rt)};
+  auto deviceIDCpp{deviceID.utf8(rt)};
+  return createPromiseAsJSIValue(
+      rt, [=](jsi::Runtime &innerRt, std::shared_ptr<Promise> promise) {
+        taskType job = [=, &innerRt]() {
+          std::string error;
+          crypto::EncryptedData initialEncryptedMessage;
+          try {
+            this->cryptoModule->initializeOutboundForSendingSession(
+                deviceIDCpp,
+                std::vector<uint8_t>(
+                    identityKeysCpp.begin(), identityKeysCpp.end()),
+                std::vector<uint8_t>(prekeyCpp.begin(), prekeyCpp.end()),
+                std::vector<uint8_t>(
+                    prekeySignatureCpp.begin(), prekeySignatureCpp.end()),
+                std::vector<uint8_t>(
+                    oneTimeKeysCpp.begin(), oneTimeKeysCpp.end()));
+
+            const std::string initMessage = "{\"type\": \"init\"}";
+            initialEncryptedMessage =
+                cryptoModule->encrypt(deviceIDCpp, initMessage);
+            this->persistCryptoModule();
+          } catch (const std::exception &e) {
+            error = e.what();
+          }
+          this->jsInvoker_->invokeAsync([=, &innerRt]() {
+            if (error.size()) {
+              promise->reject(error);
+              return;
+            }
+            promise->resolve(jsi::String::createFromUtf8(
+                innerRt,
+                std::string{
+                    initialEncryptedMessage.message.begin(),
+                    initialEncryptedMessage.message.end()}));
+          });
+        };
+        this->cryptoThread->scheduleTask(job);
+      });
+}
+
 CommCoreModule::CommCoreModule(
     std::shared_ptr<facebook::react::CallInvoker> jsInvoker)
     : facebook::react::CommCoreModuleSchemaCxxSpecJSI(jsInvoker),
diff --git a/native/cpp/CommonCpp/_generated/commJSI-generated.cpp b/native/cpp/CommonCpp/_generated/commJSI-generated.cpp
--- a/native/cpp/CommonCpp/_generated/commJSI-generated.cpp
+++ b/native/cpp/CommonCpp/_generated/commJSI-generated.cpp
@@ -81,6 +81,9 @@
 static jsi::Value __hostFunction_CommCoreModuleSchemaCxxSpecJSI_isNotificationsSessionInitialized(jsi::Runtime &rt, TurboModule &turboModule, const jsi::Value* args, size_t count) {
   return static_cast<CommCoreModuleSchemaCxxSpecJSI *>(&turboModule)->isNotificationsSessionInitialized(rt);
 }
+static jsi::Value __hostFunction_CommCoreModuleSchemaCxxSpecJSI_initializeContentOutboundSession(jsi::Runtime &rt, TurboModule &turboModule, const jsi::Value* args, size_t count) {
+  return static_cast<CommCoreModuleSchemaCxxSpecJSI *>(&turboModule)->initializeContentOutboundSession(rt, args[0].asString(rt), args[1].asString(rt), args[2].asString(rt), args[3].asString(rt), args[4].asString(rt));
+}
 static jsi::Value __hostFunction_CommCoreModuleSchemaCxxSpecJSI_getCodeVersion(jsi::Runtime &rt, TurboModule &turboModule, const jsi::Value* args, size_t count) {
   return static_cast<CommCoreModuleSchemaCxxSpecJSI *>(&turboModule)->getCodeVersion(rt);
 }
@@ -159,6 +162,7 @@
   methodMap_["generateAndGetPrekeys"] = MethodMetadata {0, __hostFunction_CommCoreModuleSchemaCxxSpecJSI_generateAndGetPrekeys};
   methodMap_["initializeNotificationsSession"] = MethodMetadata {4, __hostFunction_CommCoreModuleSchemaCxxSpecJSI_initializeNotificationsSession};
   methodMap_["isNotificationsSessionInitialized"] = MethodMetadata {0, __hostFunction_CommCoreModuleSchemaCxxSpecJSI_isNotificationsSessionInitialized};
+  methodMap_["initializeContentOutboundSession"] = MethodMetadata {5, __hostFunction_CommCoreModuleSchemaCxxSpecJSI_initializeContentOutboundSession};
   methodMap_["getCodeVersion"] = MethodMetadata {0, __hostFunction_CommCoreModuleSchemaCxxSpecJSI_getCodeVersion};
   methodMap_["terminate"] = MethodMetadata {0, __hostFunction_CommCoreModuleSchemaCxxSpecJSI_terminate};
   methodMap_["setNotifyToken"] = MethodMetadata {1, __hostFunction_CommCoreModuleSchemaCxxSpecJSI_setNotifyToken};
diff --git a/native/cpp/CommonCpp/_generated/commJSI.h b/native/cpp/CommonCpp/_generated/commJSI.h
--- a/native/cpp/CommonCpp/_generated/commJSI.h
+++ b/native/cpp/CommonCpp/_generated/commJSI.h
@@ -42,6 +42,7 @@
   virtual jsi::Value generateAndGetPrekeys(jsi::Runtime &rt) = 0;
   virtual jsi::Value initializeNotificationsSession(jsi::Runtime &rt, jsi::String identityKeys, jsi::String prekey, jsi::String prekeySignature, jsi::String oneTimeKeys) = 0;
   virtual jsi::Value isNotificationsSessionInitialized(jsi::Runtime &rt) = 0;
+  virtual jsi::Value initializeContentOutboundSession(jsi::Runtime &rt, jsi::String identityKeys, jsi::String prekey, jsi::String prekeySignature, jsi::String oneTimeKeys, jsi::String deviceID) = 0;
   virtual double getCodeVersion(jsi::Runtime &rt) = 0;
   virtual void terminate(jsi::Runtime &rt) = 0;
   virtual jsi::Value setNotifyToken(jsi::Runtime &rt, jsi::String token) = 0;
@@ -256,6 +257,14 @@
       return bridging::callFromJs<jsi::Value>(
           rt, &T::isNotificationsSessionInitialized, jsInvoker_, instance_);
     }
+    jsi::Value initializeContentOutboundSession(jsi::Runtime &rt, jsi::String identityKeys, jsi::String prekey, jsi::String prekeySignature, jsi::String oneTimeKeys, jsi::String deviceID) override {
+      static_assert(
+          bridging::getParameterCount(&T::initializeContentOutboundSession) == 6,
+          "Expected initializeContentOutboundSession(...) to have 6 parameters");
+
+      return bridging::callFromJs<jsi::Value>(
+          rt, &T::initializeContentOutboundSession, jsInvoker_, instance_, std::move(identityKeys), std::move(prekey), std::move(prekeySignature), std::move(oneTimeKeys), std::move(deviceID));
+    }
     double getCodeVersion(jsi::Runtime &rt) override {
       static_assert(
           bridging::getParameterCount(&T::getCodeVersion) == 1,
diff --git a/native/schema/CommCoreModuleSchema.js b/native/schema/CommCoreModuleSchema.js
--- a/native/schema/CommCoreModuleSchema.js
+++ b/native/schema/CommCoreModuleSchema.js
@@ -89,6 +89,13 @@
     oneTimeKeys: string,
   ) => Promise<string>;
   +isNotificationsSessionInitialized: () => Promise<boolean>;
+  +initializeContentOutboundSession: (
+    identityKeys: string,
+    prekey: string,
+    prekeySignature: string,
+    oneTimeKeys: string,
+    deviceID: string,
+  ) => Promise<string>;
   +getCodeVersion: () => number;
   +terminate: () => void;
   +setNotifyToken: (token: string) => Promise<void>;