diff --git a/conf/sip_profiles/example.xml b/conf/sip_profiles/example.xml
index fe8dd5b..513d245 100644
--- a/conf/sip_profiles/example.xml
+++ b/conf/sip_profiles/example.xml
@@ -6,6 +6,7 @@
     <param name="proxy" value="sipgate.de"/>
     <param name="username" value="USERNAME"/>
     <param name="password" value="PASSWORD"/>
+    <param name="extension" value="EXTERNALDID"/>
   </gateway>
 </include>
 -->