adds sending REFER in dialog

git-svn-id: http://svn.berlios.de/svnroot/repos/sems/trunk@140 8eb893ce-cfd4-0310-b710-fb5ebe64c474

core/AmSipDialog.cpp

@@ -398,6 +398,25 @@ int AmSipDialog::update(const string& hdrs)
     }	
 }
 
+int AmSipDialog::refer(const string& refer_to)
+{
+    switch(status){
+    case Connected:
+	return sendRequest("REFER", "", "", "Refer-To: "+refer_to);
+    case Disconnecting:
+    case Pending:
+      DBG("refer(): we are not yet connected."
+	    "(status=%i). do nothing!\n",status);
+
+      return 0;
+    default:
+      DBG("refer(): we are not connected "
+	  "(status=%i). do nothing!\n",status);
+      return 0;
+    }	
+
+}
+
 int AmSipDialog::cancel()
 {
     int cancel_cseq = -1;

core/AmSipDialog.h

@@ -141,6 +141,7 @@ public:
     int invite(const string& hdrs,  
 	       const string& content_type,
 	       const string& body);
+	int refer(const string& refer_to);
     /**
      * @return true if a transaction could be found that
      *              matches the CANCEL's one.