diff --git a/src/ca/Makefile b/src/ca/Makefile
index 93e6b27..6bed7c3 100644
--- a/src/ca/Makefile
+++ b/src/ca/Makefile
@@ -11,6 +11,7 @@ LIB_SYS_LIBS_WIN32 += ws2_32
 
 INC += pv/caProvider.h
 
+pvAccessCA_SRCS += channelConnectThread.cpp
 pvAccessCA_SRCS += monitorEventThread.cpp
 pvAccessCA_SRCS += getDoneThread.cpp
 pvAccessCA_SRCS += putDoneThread.cpp
diff --git a/src/ca/caChannel.cpp b/src/ca/caChannel.cpp
index c1f2dbe..1e33195 100644
--- a/src/ca/caChannel.cpp
+++ b/src/ca/caChannel.cpp
@@ -10,6 +10,7 @@
 #include <pv/standardField.h>
 #include <pv/logger.h>
 #include <pv/pvAccess.h>
+#include "channelConnectThread.h"
 #include "monitorEventThread.h"
 #include "getDoneThread.h"
 #include "putDoneThread.h"
@@ -76,6 +77,25 @@ void CAChannel::connected()
        ChannelRequester::shared_pointer req(channelRequester.lock());
        if(req) EXCEPTION_GUARD(req->channelCreated(Status::Ok, shared_from_this()));
     }
+    ChannelRequester::shared_pointer req(channelRequester.lock());
+    if(req) {
+        EXCEPTION_GUARD(req->channelStateChange(
+             shared_from_this(), Channel::CONNECTED));
+    }
+}
+
+void CAChannel::notifyClient()
+{
+    if(DEBUG_LEVEL>0) {
+          cout<< "CAChannel::notifyClient " << channelName << endl;
+    }
+    CAChannelProviderPtr provider(channelProvider.lock());
+    if(!provider) return;
+    provider->addChannel(shared_from_this());
+    while(!getFieldQueue.empty()) {
+        getFieldQueue.front()->activate();
+        getFieldQueue.pop();
+    }
     while(!getFieldQueue.empty()) {
         getFieldQueue.front()->activate();
         getFieldQueue.pop();
@@ -95,10 +115,9 @@ void CAChannel::connected()
         monitorQueue.pop();
     }
     ChannelRequester::shared_pointer req(channelRequester.lock());
-    if(req) {
-        EXCEPTION_GUARD(req->channelStateChange(
-             shared_from_this(), Channel::CONNECTED));
-    }
+    if(!req) return;
+    EXCEPTION_GUARD(req->channelCreated(Status::Ok, shared_from_this()));
+    EXCEPTION_GUARD(req->channelStateChange(shared_from_this(), Channel::CONNECTED));
 }
 
 void CAChannel::disconnected()
@@ -121,7 +140,8 @@ CAChannel::CAChannel(std::string const & channelName,
     channelProvider(channelProvider),
     channelRequester(channelRequester),
     channelID(0),
-    channelCreated(false)
+    channelCreated(false),
+    channelConnectThread(ChannelConnectThread::get())
 {
     if(DEBUG_LEVEL>0) {
           cout<< "CAChannel::CAChannel " << channelName << endl;
@@ -130,11 +150,13 @@ CAChannel::CAChannel(std::string const & channelName,
 
 void CAChannel::activate(short priority)
 {
+    ChannelRequester::shared_pointer req(channelRequester.lock());
+    if(!req) return;
     if(DEBUG_LEVEL>0) {
           cout<< "CAChannel::activate " << channelName << endl;
     }
-    ChannelRequester::shared_pointer req(channelRequester.lock());
-    if(!req) return;
+    notifyChannelRequester = NotifyChannelRequesterPtr(new NotifyChannelRequester());
+    notifyChannelRequester->setChannel(shared_from_this());
     attachContext();
     int result = ca_create_channel(channelName.c_str(),
          ca_connection_handler,
@@ -497,6 +519,9 @@ void CAChannelGet::getDone(struct event_handler_args &args)
 
 void CAChannelGet::notifyClient()
 {
+    if(DEBUG_LEVEL>1) {
+        std::cout << "CAChannelGet::notifyClient " <<  channel->getChannelName() << endl;
+    }
     ChannelGetRequester::shared_pointer getRequester(channelGetRequester.lock());
     if(!getRequester) return;
     EXCEPTION_GUARD(getRequester->getDone(getStatus, shared_from_this(), pvStructure, bitSet));
diff --git a/src/ca/caChannel.h b/src/ca/caChannel.h
index d5835cd..d27652d 100644
--- a/src/ca/caChannel.h
+++ b/src/ca/caChannel.h
@@ -28,6 +28,15 @@ namespace epics {
 namespace pvAccess {
 namespace ca {
 
+class CAChannel;
+typedef std::tr1::shared_ptr<CAChannel> CAChannelPtr;
+typedef std::tr1::weak_ptr<CAChannel> CAChannelWPtr;
+class ChannelConnectThread;
+typedef std::tr1::shared_ptr<ChannelConnectThread> ChannelConnectThreadPtr;
+
+class NotifyChannelRequester;
+typedef std::tr1::shared_ptr<NotifyChannelRequester> NotifyChannelRequesterPtr;
+
 class NotifyMonitorRequester;
 typedef std::tr1::shared_ptr<NotifyMonitorRequester> NotifyMonitorRequesterPtr;
 class MonitorEventThread;
@@ -113,6 +122,7 @@ public:
 
     void attachContext();
     void disconnectChannel();
+    void notifyClient();
 private:
     virtual void destroy() {}
     CAChannel(std::string const & channelName,
@@ -126,6 +136,8 @@ private:
     ChannelRequester::weak_pointer channelRequester;
     chid channelID;
     bool channelCreated;
+    ChannelConnectThreadPtr channelConnectThread;
+    NotifyChannelRequesterPtr notifyChannelRequester;
 
     epics::pvData::Mutex requestsMutex;
     std::queue<CAChannelGetFieldPtr> getFieldQueue;
diff --git a/src/ca/caProvider.cpp b/src/ca/caProvider.cpp
index 5c5b22c..09bcb8b 100644
--- a/src/ca/caProvider.cpp
+++ b/src/ca/caProvider.cpp
@@ -11,6 +11,7 @@
 #include <pv/logger.h>
 #include <pv/pvAccess.h>
 
+#include "channelConnectThread.h"
 #include "monitorEventThread.h"
 #include "getDoneThread.h"
 #include "putDoneThread.h"
@@ -39,6 +40,7 @@ CAChannelProvider::CAChannelProvider()
 
 CAChannelProvider::CAChannelProvider(const std::tr1::shared_ptr<Configuration>&)
     :  current_context(0),
+       channelConnectThread(ChannelConnectThread::get()),
        monitorEventThread(MonitorEventThread::get()),
        getDoneThread(GetDoneThread::get()),
        putDoneThread(PutDoneThread::get())
@@ -75,9 +77,10 @@ CAChannelProvider::~CAChannelProvider()
        channelQ.front()->disconnectChannel();
        channelQ.pop();
     }
-    monitorEventThread->stop();
-    getDoneThread->stop();
     putDoneThread->stop();
+    getDoneThread->stop();
+    monitorEventThread->stop();
+    channelConnectThread->stop();
     if(DEBUG_LEVEL>0) {
         std::cout << "CAChannelProvider::~CAChannelProvider() calling ca_context_destroy\n";
     }
@@ -174,10 +177,8 @@ void CAChannelProvider::attachContext()
 {
     ca_client_context* thread_context = ca_current_context();
     if (thread_context == current_context) return;
-    if (thread_context != NULL) {
-        throw std::runtime_error("CAChannelProvider::attachContext Foreign CA context in use");
-    }
     int result = ca_attach_context(current_context);
+    if(result==ECA_ISATTACHED) return;
     if (result != ECA_NORMAL) {
         std::string mess("CAChannelProvider::attachContext error  calling ca_attach_context ");
         mess += ca_message(result);
diff --git a/src/ca/caProviderPvt.h b/src/ca/caProviderPvt.h
index 0d48271..4a84c9d 100644
--- a/src/ca/caProviderPvt.h
+++ b/src/ca/caProviderPvt.h
@@ -24,6 +24,9 @@ namespace ca {
 
 #define DEBUG_LEVEL 0
 
+class ChannelConnectThread;
+typedef std::tr1::shared_ptr<ChannelConnectThread> ChannelConnectThreadPtr;
+
 class MonitorEventThread;
 typedef std::tr1::shared_ptr<MonitorEventThread> MonitorEventThreadPtr;
 
@@ -86,6 +89,7 @@ private:
     ca_client_context* current_context;
     epics::pvData::Mutex channelListMutex;
     std::vector<CAChannelWPtr> caChannelList;
+    ChannelConnectThreadPtr channelConnectThread;
     MonitorEventThreadPtr monitorEventThread;
     GetDoneThreadPtr getDoneThread;
     PutDoneThreadPtr putDoneThread;
diff --git a/src/ca/channelConnectThread.cpp b/src/ca/channelConnectThread.cpp
new file mode 100644
index 0000000..c378019
--- /dev/null
+++ b/src/ca/channelConnectThread.cpp
@@ -0,0 +1,115 @@
+/**
+ * Copyright - See the COPYRIGHT that is included with this distribution.
+ * pvAccessCPP is distributed subject to a Software License Agreement found
+ * in file LICENSE that is included with this distribution.
+ */
+/**
+ * @author mrk
+ * @date 2018.07
+ */
+
+#include "caChannel.h"
+#include <epicsExit.h>
+#define epicsExportSharedSymbols
+#include "channelConnectThread.h"
+
+using namespace epics::pvData;
+using namespace std;
+
+namespace epics {
+namespace pvAccess {
+namespace ca {
+
+ChannelConnectThreadPtr ChannelConnectThread::get()
+{
+    static  ChannelConnectThreadPtr master;
+    static Mutex mutex;
+    Lock xx(mutex);
+    if(!master) {
+        master = ChannelConnectThreadPtr(new ChannelConnectThread());
+        master->start();
+    }
+    return master;
+}
+
+ChannelConnectThread::ChannelConnectThread()
+: isStop(false)
+{
+}
+
+ChannelConnectThread::~ChannelConnectThread()
+{
+//std::cout << "ChannelConnectThread::~ChannelConnectThread()\n";
+}
+
+
+void ChannelConnectThread::start()
+{
+    thread =  std::tr1::shared_ptr<epicsThread>(new epicsThread(
+        *this,
+        "channelConnectThread",
+        epicsThreadGetStackSize(epicsThreadStackSmall),
+        epicsThreadPriorityLow));
+    thread->start(); 
+}
+
+
+void ChannelConnectThread::stop()
+{
+    {
+        Lock xx(mutex);
+        isStop = true;
+    }
+    waitForCommand.signal();
+    waitForStop.wait();
+}
+
+void ChannelConnectThread::channelConnected(
+    NotifyChannelRequesterPtr const &notifyChannelRequester)
+{
+    {   
+        Lock lock(mutex);
+        if(notifyChannelRequester->isOnQueue) return;
+        notifyChannelRequester->isOnQueue = true;
+        notifyChannelQueue.push(notifyChannelRequester);
+    }
+    waitForCommand.signal();
+}
+
+void ChannelConnectThread::run()
+{
+    while(true)
+    {
+         waitForCommand.wait();
+         while(true) {
+             bool more = false;
+             NotifyChannelRequester* notifyChannelRequester(NULL);
+             {
+                 Lock lock(mutex);
+                 if(!notifyChannelQueue.empty())
+                 {
+                      more = true;
+                      NotifyChannelRequesterWPtr req(notifyChannelQueue.front());
+                      notifyChannelQueue.pop();
+                      NotifyChannelRequesterPtr reqPtr(req.lock());
+                      if(reqPtr) {
+                         notifyChannelRequester = reqPtr.get();
+                         reqPtr->isOnQueue = false;
+                      }
+                 }
+             }
+             if(!more) break;
+             if(notifyChannelRequester!=NULL)
+             {
+                 CAChannelPtr channel(notifyChannelRequester->channel.lock());
+                 if(channel) channel->notifyClient();
+             }
+         }
+         if(isStop) {
+             waitForStop.signal();
+             break;
+         }
+    }
+}
+
+}}}
diff --git a/src/ca/channelConnectThread.h b/src/ca/channelConnectThread.h
new file mode 100644
index 0000000..7dcb568
--- /dev/null
+++ b/src/ca/channelConnectThread.h
@@ -0,0 +1,71 @@
+/**
+ * Copyright - See the COPYRIGHT that is included with this distribution.
+ * pvAccessCPP is distributed subject to a Software License Agreement found
+ * in file LICENSE that is included with this distribution.
+ */
+/**
+ * @author mrk
+ * @date 2018.07
+ */
+#ifndef ChannelConnectThread_H
+#define ChannelConnectThread_H
+#include <queue>
+#include <cadef.h>
+#include <shareLib.h>
+#include <epicsThread.h>
+#include <pv/event.h>
+#include <pv/lock.h>
+
+namespace epics {
+namespace pvAccess {
+namespace ca {
+
+class NotifyChannelRequester;
+typedef std::tr1::shared_ptr<NotifyChannelRequester> NotifyChannelRequesterPtr;
+typedef std::tr1::weak_ptr<NotifyChannelRequester> NotifyChannelRequesterWPtr;
+
+
+class ChannelConnectThread;
+typedef std::tr1::shared_ptr<ChannelConnectThread> ChannelConnectThreadPtr;
+
+class CAChannel;
+typedef std::tr1::shared_ptr<CAChannel> CAChannelPtr;
+typedef std::tr1::weak_ptr<CAChannel> CAChannelWPtr;
+
+class NotifyChannelRequester
+{
+public:
+    ChannelRequester::weak_pointer channelRequester;
+    CAChannelWPtr channel;
+    bool isOnQueue;
+    NotifyChannelRequester() : isOnQueue(false) {}
+    void setChannel(CAChannelPtr const &channel)
+    { this->channel = channel;}
+};
+
+
+class ChannelConnectThread :
+     public epicsThreadRunable
+{
+public:
+    static ChannelConnectThreadPtr get();
+    ~ChannelConnectThread();
+    virtual void run();
+    void start();
+    void stop();
+    void channelConnected(NotifyChannelRequesterPtr const &notifyChannelRequester);
+private:
+    ChannelConnectThread();
+
+    bool isStop;
+    std::tr1::shared_ptr<epicsThread> thread;
+    epics::pvData::Mutex mutex;
+    epics::pvData::Event waitForCommand;
+    epics::pvData::Event waitForStop;
+    std::queue<NotifyChannelRequesterWPtr> notifyChannelQueue;
+};
+
+
+}}}
+
+#endif  /* ChannelConnectThread_H */