diff --git a/src/net/java/sip/communicator/impl/protocol/sip/ConfigHeaders.java b/src/net/java/sip/communicator/impl/protocol/sip/ConfigHeaders.java
index ddad53d86..b01626f28 100644
--- a/src/net/java/sip/communicator/impl/protocol/sip/ConfigHeaders.java
+++ b/src/net/java/sip/communicator/impl/protocol/sip/ConfigHeaders.java
@@ -8,6 +8,7 @@
 
 import net.java.sip.communicator.util.*;
 
+import javax.sip.address.*;
 import javax.sip.header.*;
 import javax.sip.message.*;
 import java.util.*;
@@ -91,13 +92,15 @@ static void attachConfigHeaders(
         for(Map.Entry<String, String> entry : props.entrySet())
         {
             String pName = entry.getKey();
-            String prefStr = entry.getValue().trim();
+            String prefStr = entry.getValue();
             String name;
             String ix;
 
-            if(!pName.startsWith(ACC_PROPERTY_CONFIG_HEADER))
+            if(!pName.startsWith(ACC_PROPERTY_CONFIG_HEADER) || prefStr == null)
                 continue;
 
+            prefStr = prefStr.trim();
+
             if(pName.contains("."))
             {
                 pName = pName.replaceAll(ACC_PROPERTY_CONFIG_HEADER + ".", "");
@@ -191,6 +194,31 @@ private static String processParams(String value, Request request)
             }
         }
 
+        if(value.indexOf("${to.userID}") != -1)
+        {
+            ToHeader toHeader =
+                (ToHeader)request.getHeader(ToHeader.NAME);
+
+            if(toHeader != null)
+            {
+                URI toURI = toHeader.getAddress().getURI();
+                String toAddr = toURI.toString();
+
+                // strips sip: or sips:
+                if(toURI.isSipURI())
+                {
+                    toAddr = toAddr.replaceFirst(toURI.getScheme() + ":", "");
+                }
+
+                // take the userID part
+                int index = toAddr.indexOf('@');
+                if ( index > -1 )
+                    toAddr = toAddr.substring(0, index);
+
+                value = value.replace("${to.userID}", toAddr);
+            }
+        }
+
         return value;
     }
 }