diff --git a/scenarios/register/sipp_scenario.xml b/scenarios/register/sipp_scenario.xml
index 0cca5227..a03e3c48 100644
--- a/scenarios/register/sipp_scenario.xml
+++ b/scenarios/register/sipp_scenario.xml
@@ -11,7 +11,7 @@
       To: <sip:[field0 file="callee.csv"]@[field3 file="callee.csv"]>
       Call-ID: [call_id]
       CSeq: 1 REGISTER
-      Contact: sip:[field0 file="callee.csv"]@[local_ip]:50603
+      Contact: sip:[field0 file="callee.csv"]@[local_ip]:[local_port]
       Expires: 600
       Max-Forwards: 70
       Content-Length: 0
@@ -35,7 +35,7 @@
       Call-ID: [call_id]
       CSeq: 2 REGISTER
       [field2 file="callee.csv"]
-      Contact: sip:[field0 file="callee.csv"]@[local_ip]:50603
+      Contact: sip:[field0 file="callee.csv"]@[local_ip]:[local_port]
       Expires: 600
       Max-Forwards: 70
       Content-Length: 0
@@ -49,6 +49,31 @@
   <recv response="200">
   </recv>
 
+  <send>
+    <![CDATA[
+
+      REGISTER sip:[field0 file="callee.csv"]@[field3 file="callee.csv"] SIP/2.0
+      Via: SIP/2.0/[transport] [local_ip]:[local_port];branch=[branch]
+      From: <sip:[field0 file="callee.csv"]@[field3 file="callee.csv"]>;tag=[pid]SIPpTag00[call_number]
+      To: <sip:[field0 file="callee.csv"]@[field3 file="callee.csv"]>
+      Call-ID: [call_id]
+      CSeq: 2 REGISTER
+      [field2 file="callee.csv"]
+      Contact: sip:[field0 file="callee.csv"]@[local_ip]:[local_port]
+      Expires: 0
+      Max-Forwards: 70
+      Content-Length: 0
+
+    ]]>
+  </send>
+  
+  <recv response="100" optional="true">
+  </recv>
+
+  <recv response="200">
+  </recv>
+
+
   <ResponseTimeRepartition value="10, 20, 30, 40, 50, 100, 150, 200"/>
 
 </scenario>