diff --git a/include/channel.h b/include/channel.h
index 94a7b99..39a2229 100644
--- a/include/channel.h
+++ b/include/channel.h
@@ -52,8 +52,7 @@ public:
      */
     void onReady(const SuccessCallback &callback)
     {
-        // store callback in implementation
-        _implementation->_readyCallback = callback;
+        _implementation->onReady(callback);
     }
 
     /**
@@ -66,8 +65,7 @@ public:
      */
     void onError(const ErrorCallback &callback)
     {
-        // store callback in implementation
-        _implementation->_errorCallback = callback;
+        _implementation->onError(callback);
     }
 
     /**
diff --git a/include/channelimpl.h b/include/channelimpl.h
index f03930d..b9c51db 100644
--- a/include/channelimpl.h
+++ b/include/channelimpl.h
@@ -144,9 +144,40 @@ public:
      */
     void detach()
     {
+        // connection is gone
         _connection = nullptr;
     }
 
+    /**
+     *  Callback that is called when the channel was succesfully created.
+     *  @param  callback    the callback to execute
+     */
+    void onReady(const SuccessCallback &callback)
+    {
+        // store callback
+        _readyCallback = callback;
+        
+        // direct call if channel is already ready
+        if (_state == state_connected) callback();
+    }
+
+    /**
+     *  Callback that is called when an error occurs.
+     *
+     *  Only one error callback can be registered. Calling this function
+     *  multiple times will remove the old callback.
+     *
+     *  @param  callback    the callback to execute
+     */
+    void onError(const ErrorCallback &callback)
+    {
+        // store callback
+        _errorCallback = callback;
+        
+        // direct call if channel is already in error state
+        if (_state != state_connected) callback("Channel is in error state");
+    }
+
     /**
      *  Pause deliveries on a channel
      *
@@ -480,7 +511,7 @@ public:
      */
     bool waiting() const
     {
-        return _synchronous;
+        return _synchronous || !_queue.empty();
     }
 
     /**
diff --git a/src/channelimpl.cpp b/src/channelimpl.cpp
index 5fa756f..4b49942 100644
--- a/src/channelimpl.cpp
+++ b/src/channelimpl.cpp
@@ -80,13 +80,16 @@ void ChannelImpl::attach(Connection *connection)
         // this is invalid
         _state = state_closed;
     }
-    else
+    else 
     {
-        // busy connecting
+        // assume channel is connected
         _state = state_connected;
-        
-        // valid id, send a channel open frame
-        send(ChannelOpenFrame(_id));
+    
+        // send the open frame
+        if (send(ChannelOpenFrame(_id))) return;
+
+        // report an error
+        reportError("Channel could not be initialized", true);
     }
 }    
 
@@ -663,11 +666,14 @@ bool ChannelImpl::send(const Frame &frame)
         return true;
     }
 
-    // enter synchronous mode if necessary
-    _synchronous = frame.synchronous();
-
     // send to tcp connection
-    return _connection->send(frame);
+    if (!_connection->send(frame)) return false;
+    
+    // frame was sent, if this was a synchronous frame, we now have to wait
+    _synchronous = frame.synchronous();
+    
+    // done
+    return true;
 }
 
 /**