diff --git a/src/danog/MadelineProto/Ipc/Client.php b/src/danog/MadelineProto/Ipc/Client.php
index 2e52f76b..2699f06a 100644
--- a/src/danog/MadelineProto/Ipc/Client.php
+++ b/src/danog/MadelineProto/Ipc/Client.php
@@ -40,11 +40,19 @@ class Client
     /**
      * IPC server socket.
      */
-    private ChannelledSocket $server;
+    protected ChannelledSocket $server;
+    /**
+     * Callback IPC server socket.
+     */
+    private ?ChannelledSocket $serverCallback = null;
     /**
      * Requests promise array.
      */
     private array $requests = [];
+    /**
+     * Wrappers array.
+     */
+    private array $wrappers = [];
     /**
      * Whether to run loop.
      */
@@ -102,6 +110,9 @@ class Client
                 } else {
                     $promise = $this->requests[$id];
                     unset($this->requests[$id]);
+                    if (isset($this->wrappers[$id])) {
+                        unset($this->wrappers[$id]);
+                    }
                     if ($payload instanceof ExitFailure) {
                         $promise->fail($payload->getException());
                     } else {
@@ -123,7 +134,7 @@ class Client
      *
      * @param callable $callback Async callable to run
      *
-     * @return mixed
+     * @return \Generator
      */
     public function loop(callable $callback): \Generator
     {
@@ -180,14 +191,17 @@ class Client
     /**
      * Call function.
      *
-     * @param string $function  Function name
-     * @param array  $arguments Arguments
+     * @param string|int    $function  Function name
+     * @param array|Wrapper $arguments Arguments
      *
      * @return \Generator
      */
-    public function __call(string $function, array $arguments): \Generator
+    public function __call($function, $arguments): \Generator
     {
         $this->requests []= $deferred = new Deferred;
+        if ($arguments instanceof Wrapper) {
+            $this->wrappers[count($this->requests) - 1] = $arguments;
+        }
         yield $this->server->send([$function, $arguments]);
         return yield $deferred->promise();
     }
diff --git a/src/danog/MadelineProto/Ipc/Server.php b/src/danog/MadelineProto/Ipc/Server.php
index 40fd8f49..aa8cad73 100644
--- a/src/danog/MadelineProto/Ipc/Server.php
+++ b/src/danog/MadelineProto/Ipc/Server.php
@@ -51,18 +51,24 @@ class Server extends SignalLoop
     /**
      * IPC server.
      */
-    private IpcServer $server;
+    protected IpcServer $server;
+    /**
+     * Callback IPC server.
+     */
+    private ServerCallback $callback;
     /**
      * Set IPC path.
      *
-     * @param string $path IPC path
+     * @param SessionPaths $session Session
      *
      * @return void
      */
-    public function setIpcPath(string $path): void
+    public function setIpcPath(SessionPaths $session): void
     {
         self::$shutdownDeferred = new Deferred;
-        $this->server = new IpcServer($path);
+        $this->server = new IpcServer($session->getIpcPath());
+        $this->callback = new ServerCallback($this->API);
+        $this->callback->setIpcPath($session);
     }
     /**
      * Start IPC server in background.
@@ -134,15 +140,16 @@ class Server extends SignalLoop
             Tools::callFork($this->clientLoop($socket));
         }
         $this->server->close();
+        $this->callback->signal(null);
     }
     /**
      * Client handler loop.
      *
      * @param ChannelledSocket $socket Client
      *
-     * @return \Generator
+     * @return \Generator|Promise
      */
-    private function clientLoop(ChannelledSocket $socket): \Generator
+    protected function clientLoop(ChannelledSocket $socket)
     {
         $this->API->logger("Accepted IPC client connection!");
 
@@ -167,13 +174,16 @@ class Server extends SignalLoop
      *
      * @param ChannelledSocket $socket  Socket
      * @param integer          $id      Request ID
-     * @param array            $payload Payload
+     * @param array|Wrapper    $payload Payload
      *
      * @return \Generator
      */
-    public function clientRequest(ChannelledSocket $socket, int $id, $payload): \Generator
+    private function clientRequest(ChannelledSocket $socket, int $id, $payload): \Generator
     {
         try {
+            if ($payload[1] instanceof Wrapper) {
+                $payload[1] = $this->callback->unwrap($payload[1]);
+            }
             $result = $this->API->{$payload[0]}(...$payload[1]);
             $result = $result instanceof \Generator ? yield from $result : yield $result;
         } catch (\Throwable $e) {
diff --git a/src/danog/MadelineProto/Ipc/ServerCallback.php b/src/danog/MadelineProto/Ipc/ServerCallback.php
new file mode 100644
index 00000000..282a8f90
--- /dev/null
+++ b/src/danog/MadelineProto/Ipc/ServerCallback.php
@@ -0,0 +1,97 @@
+<?php
+/**
+ * IPC callback server.
+ *
+ * This file is part of MadelineProto.
+ * MadelineProto is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ * MadelineProto is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU Affero General Public License for more details.
+ * You should have received a copy of the GNU General Public License along with MadelineProto.
+ * If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    Daniil Gentili <daniil@daniil.it>
+ * @copyright 2016-2020 Daniil Gentili <daniil@daniil.it>
+ * @license   https://opensource.org/licenses/AGPL-3.0 AGPLv3
+ *
+ * @link https://docs.madelineproto.xyz MadelineProto documentation
+ */
+
+namespace danog\MadelineProto\Ipc;
+
+use Amp\Ipc\IpcServer;
+use Amp\Ipc\Sync\ChannelledSocket;
+use Amp\Loop;
+use Amp\Promise;
+use danog\MadelineProto\Exception;
+use danog\MadelineProto\SessionPaths;
+
+/**
+ * IPC callback server.
+ */
+class ServerCallback extends Server
+{
+    /**
+     * Timeout watcher list, indexed by socket ID.
+     *
+     * @var array<int, string>
+     */
+    private $watcherList = [];
+    /**
+     * Timeout watcher list, indexed by socket ID.
+     *
+     * @var array<int, ChannelledSocket>
+     */
+    private $socketList = [];
+    /**
+     * Counter.
+     */
+    private int $id = 0;
+    /**
+     * Set IPC path.
+     *
+     * @param SessionPaths $session Session
+     *
+     * @return void
+     */
+    public function setIpcPath(SessionPaths $session): void
+    {
+        $this->server = new IpcServer($session->getIpcCallbackPath());
+    }
+    /**
+     * Client handler loop.
+     *
+     * @param ChannelledSocket $socket Client
+     *
+     * @return Promise
+     */
+    protected function clientLoop(ChannelledSocket $socket)
+    {
+        $this->API->logger("Accepted IPC callback connection!");
+        $id = $this->id++;
+        $this->socketList[$id] = $socket;
+        $this->watcherList[$id] = Loop::delay(30*1000, function () use ($id) {
+            unset($this->watcherList[$id], $this->socketList[$id]);
+        });
+
+        return $socket->send($id);
+    }
+
+
+    /**
+     * Unwrap value
+     *
+     * @param Wrapper $wrapper
+     * @return mixed
+     */
+    protected function unwrap(Wrapper $wrapper)
+    {
+        $id = $wrapper->getRemoteId();
+        if (!isset($this->socketList[$id])) {
+            throw new Exception("IPC timeout, could not find callback socket!");
+        }
+        $socket = $this->socketList[$id];
+        Loop::cancel($this->watcherList[$id]);
+        unset($this->watcherList[$id], $this->socketList[$id]);
+        return $wrapper->unwrap($socket);
+    }
+}
diff --git a/src/danog/MadelineProto/Ipc/Wrapper.php b/src/danog/MadelineProto/Ipc/Wrapper.php
new file mode 100644
index 00000000..a73d5993
--- /dev/null
+++ b/src/danog/MadelineProto/Ipc/Wrapper.php
@@ -0,0 +1,210 @@
+<?php
+
+namespace danog\MadelineProto\Ipc;
+
+use Amp\ByteStream\InputStream as ByteStreamInputStream;
+use Amp\ByteStream\OutputStream as ByteStreamOutputStream;
+use Amp\Ipc\Sync\ChannelledSocket;
+use Amp\Parallel\Sync\ExitFailure;
+use danog\MadelineProto\Ipc\Wrapper\InputStream;
+use danog\MadelineProto\Ipc\Wrapper\Obj;
+use danog\MadelineProto\Ipc\Wrapper\OutputStream;
+use danog\MadelineProto\Logger;
+use danog\MadelineProto\Tools;
+
+use function Amp\Ipc\connect;
+
+/**
+ * Callback payload wrapper.
+ */
+class Wrapper extends Client
+{
+    /**
+     * Payload data.
+     *
+     * @var mixed
+     */
+    private $data;
+    /**
+     * Callbacks.
+     *
+     * @var callable[]
+     */
+    private array $callbacks = [];
+    /**
+     * Callbacks IDs.
+     *
+     * @var (int|array{0: class-string<Obj>, array<string, int>})[]
+     */
+    private array $callbackIds = [];
+    /**
+     * Callback ID.
+     */
+    private int $id = 0;
+    /**
+     * Remote socket ID.
+     */
+    private int $remoteId = 0;
+    /**
+     * Logger instance.
+     */
+    private Logger $logger;
+    /**
+     * Constructor.
+     *
+     * @param mixed  $data Payload data
+     * @param string $ipc  IPC URI
+     *
+     * @return \Generator
+     */
+    public static function create(&$data, string $ipc, Logger $logger): \Generator
+    {
+        $instance = new self;
+        $instance->data = &$data;
+        $instance->server = yield connect($ipc);
+        $instance->remoteId = yield $instance->server->receive();
+        $instance->logger = $logger;
+        Tools::callFork($instance->receiverLoop());
+        return $instance;
+    }
+    private function __construct()
+    {
+    }
+    /**
+     * Serialization function.
+     *
+     * @return array
+     */
+    public function __sleep(): array
+    {
+        return ['data', 'callbackIds'];
+    }
+    /**
+     * Wrap a certain callback object.
+     *
+     * @param object|callable $callback Object to wrap
+     *
+     * @param-out int $callback Callback ID
+     *
+     * @return void
+     */
+    public function wrap(&$callback): void
+    {
+        if (\is_object($callback)) {
+            $ids = [];
+            foreach (\get_class_methods($callback) as $method) {
+                $id = $this->id++;
+                $this->callbacks[$id] = [$callback, $method];
+                $ids[$method] = $id;
+            }
+            $callback = $ids;
+            $this->callbackIds[] = &$callback;
+        } else {
+            $id = $this->id++;
+            $this->callbacks[$id] = self::copy($callback);
+            $class = Obj::class;
+            if ($callback instanceof ByteStreamInputStream) {
+                $class = InputStream::class;
+            } else if ($callback instanceof ByteStreamOutputStream) {
+                $class = OutputStream::class;
+            }
+            if ($class !== Obj::class && method_exists($callback, 'seek')) {
+                $class = "Seekable$class";
+            }
+            $callback = [$class, $id]; // Will be re-filled later
+            $this->callbackIds[] = &$callback;
+        }
+    }
+    /**
+     * Get copy of data.
+     *
+     * @param mixed $data
+     * @return mixed
+     */
+    private static function copy($data)
+    {
+        return $data;
+    }
+    /**
+     * Receiver loop.
+     *
+     * @return \Generator
+     */
+    private function receiverLoop(): \Generator
+    {
+        $id = 0;
+        $payload = null;
+        try {
+            while ($payload = yield $this->server->receive()) {
+                Tools::callFork($this->clientRequest($id++, $payload));
+            }
+        } finally {
+            yield $this->server->disconnect();
+        }
+    }
+
+    /**
+     * Handle client request.
+     *
+     * @param integer          $id      Request ID
+     * @param array            $payload Payload
+     *
+     * @return \Generator
+     */
+    private function clientRequest(int $id, $payload): \Generator
+    {
+        try {
+            $result = $this->callbacks[$payload[0]](...$payload[1]);
+            $result = $result instanceof \Generator ? yield from $result : yield $result;
+        } catch (\Throwable $e) {
+            $this->logger->logger("Got error while calling reverse IPC method: $e", Logger::ERROR);
+            $result = new ExitFailure($e);
+        }
+        try {
+            yield $this->server->send([$id, $result]);
+        } catch (\Throwable $e) {
+            $this->logger->logger("Got error while trying to send result of reverse method: $e", Logger::ERROR);
+            try {
+                yield $this->server->send([$id, new ExitFailure($e)]);
+            } catch (\Throwable $e) {
+                $this->logger->logger("Got error while trying to send error of error of reverse method: $e", Logger::ERROR);
+            }
+        }
+    }
+    /**
+     * Get remote socket ID.
+     *
+     * @internal
+     *
+     * @return int
+     */
+    public function getRemoteId(): int
+    {
+        return $this->remoteId;
+    }
+
+    /**
+     * Set socket and unwrap data.
+     *
+     * @param ChannelledSocket $server Socket.
+     *
+     * @internal
+     *
+     * @return mixed
+     */
+    public function unwrap(ChannelledSocket $server)
+    {
+        $this->server = $server;
+        Tools::callFork($this->loopInternal());
+
+        foreach ($this->callbackIds as &$id) {
+            if (\is_int($id)) {
+                $id = fn (...$args): \Generator => $this->__call($id, $args);
+            } else {
+                [$class, $ids] = $id;
+                $id = new $class($this, $ids);
+            }
+        }
+        return $this->data;
+    }
+}
diff --git a/src/danog/MadelineProto/Ipc/Wrapper/InputStream.php b/src/danog/MadelineProto/Ipc/Wrapper/InputStream.php
new file mode 100644
index 00000000..d5cb29c1
--- /dev/null
+++ b/src/danog/MadelineProto/Ipc/Wrapper/InputStream.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace danog\MadelineProto\Ipc\Wrapper;
+
+use Amp\ByteStream\InputStream as AmpInputStream;
+use Amp\Promise;
+use danog\MadelineProto\Ipc\Wrapper\Obj;
+use danog\MadelineProto\Tools;
+
+class InputStream extends Obj implements AmpInputStream
+{
+    /**
+     * Reads data from the stream.
+     *
+     * @return Promise Resolves with a string when new data is available or `null` if the stream has closed.
+     *
+     * @psalm-return Promise<string|null>
+     *
+     * @throws PendingReadError Thrown if another read operation is still pending.
+     */
+    public function read(): Promise
+    {
+        return Tools::call($this->__call('read'));
+    }
+}
diff --git a/src/danog/MadelineProto/Ipc/Wrapper/Obj.php b/src/danog/MadelineProto/Ipc/Wrapper/Obj.php
new file mode 100644
index 00000000..be5b5b8e
--- /dev/null
+++ b/src/danog/MadelineProto/Ipc/Wrapper/Obj.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace danog\MadelineProto\Ipc\Wrapper;
+
+use danog\MadelineProto\Ipc\Wrapper;
+
+/**
+ * Generic callback wrapper object.
+ */
+class Obj
+{
+    /**
+     * Method list.
+     *
+     * @var array<string, int>
+     */
+    private array $methods = [];
+    /**
+     * Wrapper
+     */
+    private Wrapper $wrapper;
+    /**
+     * Constructor
+     *
+     * @param Wrapper $wrapper
+     * @param array $methods
+     */
+    public function __construct(Wrapper $wrapper, array $methods)
+    {
+        $this->wrapper = $wrapper;
+        $this->methods = $methods;
+    }
+    /**
+     * Call method.
+     *
+     * @param string $name
+     * @param array $arguments
+     *
+     * @return \Generator
+     */
+    public function __call(string $name, array $arguments = []): \Generator
+    {
+        return $this->wrapper->__call($this->methods[$name], $arguments);
+    }
+}
diff --git a/src/danog/MadelineProto/Ipc/Wrapper/OutputStream.php b/src/danog/MadelineProto/Ipc/Wrapper/OutputStream.php
new file mode 100644
index 00000000..e5e8630e
--- /dev/null
+++ b/src/danog/MadelineProto/Ipc/Wrapper/OutputStream.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace danog\MadelineProto\Ipc\Wrapper;
+
+use Amp\ByteStream\OutputStream as AmpOutputStream;
+use Amp\Promise;
+use danog\MadelineProto\Ipc\Wrapper\Obj;
+use danog\MadelineProto\Tools;
+
+class OutputStream extends Obj implements AmpOutputStream
+{
+    /**
+     * Writes data to the stream.
+     *
+     * @param string $data Bytes to write.
+     *
+     * @return Promise Succeeds once the data has been successfully written to the stream.
+     *
+     * @throws ClosedException If the stream has already been closed.
+     * @throws StreamException If writing to the stream fails.
+     */
+    public function write(string $data): Promise
+    {
+        return Tools::call($this->__call('write', [$data]));
+    }
+
+    /**
+     * Marks the stream as no longer writable. Optionally writes a final data chunk before. Note that this is not the
+     * same as forcefully closing the stream. This method waits for all pending writes to complete before closing the
+     * stream. Socket streams implementing this interface should only close the writable side of the stream.
+     *
+     * @param string $finalData Bytes to write.
+     *
+     * @return Promise Succeeds once the data has been successfully written to the stream.
+     *
+     * @throws ClosedException If the stream has already been closed.
+     * @throws StreamException If writing to the stream fails.
+     */
+    public function end(string $finalData = ""): Promise
+    {
+        return Tools::call($this->__call('write', [$finalData]));
+    }
+}
diff --git a/src/danog/MadelineProto/Ipc/Wrapper/SeekableInputStream.php b/src/danog/MadelineProto/Ipc/Wrapper/SeekableInputStream.php
new file mode 100644
index 00000000..f0adf543
--- /dev/null
+++ b/src/danog/MadelineProto/Ipc/Wrapper/SeekableInputStream.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace danog\MadelineProto\Ipc\Wrapper;
+
+class SeekableInputStream extends InputStream 
+{
+    use SeekableTrait;
+}
\ No newline at end of file
diff --git a/src/danog/MadelineProto/Ipc/Wrapper/SeekableOutputStream.php b/src/danog/MadelineProto/Ipc/Wrapper/SeekableOutputStream.php
new file mode 100644
index 00000000..d7bd033b
--- /dev/null
+++ b/src/danog/MadelineProto/Ipc/Wrapper/SeekableOutputStream.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace danog\MadelineProto\Ipc\Wrapper;
+
+class SeekableOutputStream extends OutputStream 
+{
+    use SeekableTrait;
+}
\ No newline at end of file
diff --git a/src/danog/MadelineProto/Ipc/Wrapper/SeekableTrait.php b/src/danog/MadelineProto/Ipc/Wrapper/SeekableTrait.php
new file mode 100644
index 00000000..00483bbd
--- /dev/null
+++ b/src/danog/MadelineProto/Ipc/Wrapper/SeekableTrait.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace danog\MadelineProto\Ipc\Wrapper;
+
+use Amp\Promise;
+use danog\MadelineProto\Tools;
+
+trait SeekableTrait
+{
+    /**
+    * Set the handle's internal pointer position.
+    *
+    * $whence values:
+    *
+    * SEEK_SET - Set position equal to offset bytes.
+    * SEEK_CUR - Set position to current location plus offset.
+    * SEEK_END - Set position to end-of-file plus offset.
+    *
+    * @param int $position
+    * @param int $whence
+    * @return \Amp\Promise<int> New offset position.
+    */
+    public function seek(int $position, int $whence = \SEEK_SET): Promise
+    {
+        return Tools::call($this->__call('seek', [$position, $whence]));
+    }
+}
diff --git a/src/danog/MadelineProto/MTProto.php b/src/danog/MadelineProto/MTProto.php
index 93e2c2d2..f7a3f0bb 100644
--- a/src/danog/MadelineProto/MTProto.php
+++ b/src/danog/MadelineProto/MTProto.php
@@ -32,6 +32,7 @@ use danog\MadelineProto\Db\DbPropertiesFactory;
 use danog\MadelineProto\Db\DbPropertiesTrait;
 use danog\MadelineProto\Db\MemoryArray;
 use danog\MadelineProto\Ipc\Server;
+use danog\MadelineProto\Ipc\ServerCallback;
 use danog\MadelineProto\Loop\Generic\PeriodicLoopInternal;
 use danog\MadelineProto\Loop\Update\FeedLoop;
 use danog\MadelineProto\Loop\Update\SeqLoop;
@@ -206,7 +207,7 @@ class MTProto extends AsyncConstruct implements TLCallback
     /**
      * Instance of wrapper API.
      *
-     * @var null|APIWrapper
+     * @var APIWrapper
      */
     public $wrapper;
     /**
@@ -825,7 +826,7 @@ class MTProto extends AsyncConstruct implements TLCallback
         }
         if (!$this->ipcServer) {
             $this->ipcServer = new Server($this);
-            $this->ipcServer->setIpcPath($this->wrapper->getIpcPath());
+            $this->ipcServer->setIpcPath($this->wrapper->session);
         }
         $this->callCheckerLoop->start();
         $this->serializeLoop->start();
diff --git a/src/danog/MadelineProto/MTProtoTools/Files.php b/src/danog/MadelineProto/MTProtoTools/Files.php
index 18584e34..6fa8fff9 100644
--- a/src/danog/MadelineProto/MTProtoTools/Files.php
+++ b/src/danog/MadelineProto/MTProtoTools/Files.php
@@ -1074,7 +1074,7 @@ trait Files
      */
     public function downloadToStream($messageMedia, $stream, $cb = null, int $offset = 0, int $end = -1): \Generator
     {
-        $messageMedia = (yield from $this->getDownloadInfo($messageMedia));
+        $messageMedia = yield from $this->getDownloadInfo($messageMedia);
         if (\is_object($stream) && $stream instanceof FileCallbackInterface) {
             $cb = $stream;
             $stream = $stream->getFile();
diff --git a/src/danog/MadelineProto/SessionPaths.php b/src/danog/MadelineProto/SessionPaths.php
index f3056a48..af089a8f 100644
--- a/src/danog/MadelineProto/SessionPaths.php
+++ b/src/danog/MadelineProto/SessionPaths.php
@@ -49,6 +49,10 @@ class SessionPaths
      * IPC socket path.
      */
     private string $ipcPath;
+    /**
+     * IPC callback socket path.
+     */
+    private string $ipcCallbackPath;
     /**
      * IPC light state path.
      */
@@ -75,6 +79,7 @@ class SessionPaths
         $this->lightStatePath = "$session.lightState.php";
         $this->lockPath = "$session.lock";
         $this->ipcPath = "$session.ipc";
+        $this->ipcCallbackPath = "$session.callback.ipc";
         $this->ipcStatePath = "$session.ipcState.php";
     }
     /**
@@ -243,4 +248,14 @@ class SessionPaths
         $this->lightState = new LightState($state);
         return $this->serialize($this->lightState, $this->getLightStatePath());
     }
+
+    /**
+     * Get IPC callback socket path.
+     *
+     * @return string
+     */
+    public function getIpcCallbackPath(): string
+    {
+        return $this->ipcCallbackPath;
+    }
 }