diff --git a/engine/Client.cpp b/engine/Client.cpp
index 6b7a0fcd..acc6299f 100644
--- a/engine/Client.cpp
+++ b/engine/Client.cpp
@@ -799,6 +799,7 @@ void Client::loadUI(const char* file, bool init)
 void Client::run()
 {
     Debug(ClientDriver::self(),DebugAll,"Client::run() [%p]",this);
+    ClientLogic::initStaticData();
     Engine::install(new EngineStartHandler);
     loadUI();
     // Run
diff --git a/engine/ClientLogic.cpp b/engine/ClientLogic.cpp
index 078c801f..88441e65 100644
--- a/engine/ClientLogic.cpp
+++ b/engine/ClientLogic.cpp
@@ -50,7 +50,8 @@ static String s_notSelected = "-none-";
 static unsigned int s_maxCallHistory = 20;
 
 ObjList ClientLogic::s_accOptions;
-String ClientLogic::s_protocols[ClientLogic::OtherProtocol] = {"sip","jabber","h323","iax"};
+ObjList ClientLogic::s_protocols;
+Mutex ClientLogic::s_protocolsMutex(true);
 // Parameters that are applied from provider template
 const char* ClientLogic::s_provParams[] = {
     "server",
@@ -879,8 +880,13 @@ bool ClientLogic::editAccount(bool newAcc, NamedList* params, Window* wnd)
     // Protocol combo and specific widget (page) data
     selectProtocolSpec(*params,proto,m_accShowAdvanced);
     NamedString* tmp = params->getParam("acc_options");
-    for (int i = 0; i < OtherProtocol; i++)
-	updateProtocolSpec(*params,s_protocols[i],tmp ? *tmp : String::empty());
+    s_protocolsMutex.lock();
+    for (ObjList* o = s_protocols.skipNull(); o; o = o->skipNext()) {
+	String* s = static_cast<String*>(o->get());
+	if (*s)
+	    updateProtocolSpec(*params,*s,tmp ? *tmp : String::empty());
+    }
+    s_protocolsMutex.unlock();
     params->setParam("context",acc);
     params->setParam("acc_account",acc);
     params->setParam("modal",String::boolText(true));
@@ -2013,14 +2019,6 @@ bool ClientLogic::defaultMsgHandler(Message& msg, int id, bool& stopLogic)
 // Client created and initialized all windows
 void ClientLogic::initializedWindows()
 {
-    // Build account options list
-    if (!s_accOptions.skipNull()) {
-	s_accOptions.append(new String("allowplainauth"));
-	s_accOptions.append(new String("noautorestart"));
-	s_accOptions.append(new String("oldstyleauth"));
-	s_accOptions.append(new String("tlsrequired"));
-    }
-
     if (!Client::self())
 	return;
 
@@ -2029,12 +2027,17 @@ void ClientLogic::initializedWindows()
     String acc_proto = "acc_protocol";
     if (!Client::self()->hasOption(proto,s_notSelected))
 	Client::self()->addOption(proto,s_notSelected,true);
-    for (int i = 0; i < OtherProtocol; i++) {
-	if (!Client::self()->hasOption(proto,s_protocols[i]))
-	    Client::self()->addOption(proto,s_protocols[i],false);
-	if (!Client::self()->hasOption(acc_proto,s_protocols[i]))
-	    Client::self()->addOption(acc_proto,s_protocols[i],false);
+    s_protocolsMutex.lock();
+    for (ObjList* o = s_protocols.skipNull(); o; o = o->skipNext()) {
+	String* s = static_cast<String*>(o->get());
+	if (!*s)
+	    continue;
+	if (!Client::self()->hasOption(proto,*s))
+	    Client::self()->addOption(proto,*s,false);
+	if (!Client::self()->hasOption(acc_proto,*s))
+	    Client::self()->addOption(acc_proto,*s,false);
     }
+    s_protocolsMutex.unlock();
     // Add account/providers 'not selected' item
     String tmp = "account";
     if (!Client::self()->hasOption(tmp,s_notSelected))
@@ -2221,6 +2224,28 @@ void ClientLogic::clearDurationUpdate()
     m_durationUpdate.clear();
 }
 
+// Init static logic data
+void ClientLogic::initStaticData()
+{
+    // Build account options list
+    if (!s_accOptions.skipNull()) {
+	s_accOptions.append(new String("allowplainauth"));
+	s_accOptions.append(new String("noautorestart"));
+	s_accOptions.append(new String("oldstyleauth"));
+	s_accOptions.append(new String("tlsrequired"));
+    }
+
+    // Build protocol list
+    s_protocolsMutex.lock();
+    if (!s_protocols.skipNull()) {
+	s_protocols.append(new String("sip"));
+	s_protocols.append(new String("jabber"));
+	s_protocols.append(new String("h323"));
+	s_protocols.append(new String("iax"));
+    }
+    s_protocolsMutex.unlock();
+}
+
 // Method called by the client when idle
 void ClientLogic::idleTimerTick(Time& time)
 {
diff --git a/yatecbase.h b/yatecbase.h
index aeec0541..bdad128f 100644
--- a/yatecbase.h
+++ b/yatecbase.h
@@ -1636,17 +1636,6 @@ class YATE_API ClientLogic : public GenObject
 {
     friend class Client;
 public:
-    /**
-     * Known voip protocols
-     */
-    enum Protocol {
-	SIP           = 0,
-	JABBER        = 1,
-	H323          = 2,
-	IAX           = 3,
-	OtherProtocol = 4
-    };
-
     /**
      * Constructor. Append itself to the client's list
      */
@@ -2097,12 +2086,16 @@ public:
      */
     void clearDurationUpdate();
 
+    /**
+     * Init static logic lists.
+     * Called by the client when start running
+     */
+    static void initStaticData();
+
     // Account options string list
     static ObjList s_accOptions;
     // Parameters that are applied from provider template
     static const char* s_provParams[];
-    // The list of protocols supported by the client
-    static String s_protocols[OtherProtocol];
 
 protected:
     /**
@@ -2134,6 +2127,11 @@ protected:
      */
     virtual void channelSelectionChanged(const String& old);
 
+    // The list of protocols supported by the client
+    static ObjList s_protocols;
+    // Mutext used to lock protocol list
+    static Mutex s_protocolsMutex;
+
     String m_name;                       // Logic's name
     String m_selectedChannel;            // The currently selected channel
     int m_prio;                          // Logics priority