diff --git a/scenarios/invite/sipp_scenario00.xml b/scenarios/invite/sipp_scenario00.xml
index 16c7ff13..245dde5f 100644
--- a/scenarios/invite/sipp_scenario00.xml
+++ b/scenarios/invite/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_allowedcli_match/sipp_scenario00.xml b/scenarios/invite_allowedcli_match/sipp_scenario00.xml
index 1052fbce..047d2721 100644
--- a/scenarios/invite_allowedcli_match/sipp_scenario00.xml
+++ b/scenarios/invite_allowedcli_match/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_allowedcli_nonmatch/sipp_scenario00.xml b/scenarios/invite_allowedcli_nonmatch/sipp_scenario00.xml
index 9e833cec..a0bdc862 100644
--- a/scenarios/invite_allowedcli_nonmatch/sipp_scenario00.xml
+++ b/scenarios/invite_allowedcli_nonmatch/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_allowip/sipp_scenario00.xml b/scenarios/invite_allowip/sipp_scenario00.xml
index 0e730561..ceecc71a 100644
--- a/scenarios/invite_allowip/sipp_scenario00.xml
+++ b/scenarios/invite_allowip/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_blockin_blst/sipp_scenario00.xml b/scenarios/invite_blockin_blst/sipp_scenario00.xml
index 10d0b810..395f24ad 100644
--- a/scenarios/invite_blockin_blst/sipp_scenario00.xml
+++ b/scenarios/invite_blockin_blst/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_blockin_clir/sipp_scenario00.xml b/scenarios/invite_blockin_clir/sipp_scenario00.xml
index 10d0b810..395f24ad 100644
--- a/scenarios/invite_blockin_clir/sipp_scenario00.xml
+++ b/scenarios/invite_blockin_clir/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_blockin_wlst/sipp_scenario00.xml b/scenarios/invite_blockin_wlst/sipp_scenario00.xml
index 10d0b810..395f24ad 100644
--- a/scenarios/invite_blockin_wlst/sipp_scenario00.xml
+++ b/scenarios/invite_blockin_wlst/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_blockout_blst/sipp_scenario00.xml b/scenarios/invite_blockout_blst/sipp_scenario00.xml
index 10d0b810..395f24ad 100644
--- a/scenarios/invite_blockout_blst/sipp_scenario00.xml
+++ b/scenarios/invite_blockout_blst/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_blockout_ncos/sipp_scenario00.xml b/scenarios/invite_blockout_ncos/sipp_scenario00.xml
index 10d0b810..395f24ad 100644
--- a/scenarios/invite_blockout_ncos/sipp_scenario00.xml
+++ b/scenarios/invite_blockout_ncos/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_blockout_pinoverride/sipp_scenario00.xml b/scenarios/invite_blockout_pinoverride/sipp_scenario00.xml
index effb92c0..2460d548 100644
--- a/scenarios/invite_blockout_pinoverride/sipp_scenario00.xml
+++ b/scenarios/invite_blockout_pinoverride/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_blockout_wlst/sipp_scenario00.xml b/scenarios/invite_blockout_wlst/sipp_scenario00.xml
index 10d0b810..395f24ad 100644
--- a/scenarios/invite_blockout_wlst/sipp_scenario00.xml
+++ b/scenarios/invite_blockout_wlst/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_callforward/sipp_scenario00.xml b/scenarios/invite_callforward/sipp_scenario00.xml
index 9057392c..5434e8e2 100644
--- a/scenarios/invite_callforward/sipp_scenario00.xml
+++ b/scenarios/invite_callforward/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_callforward/sipp_scenario01.xml b/scenarios/invite_callforward/sipp_scenario01.xml
index 0893c490..91c7ca01 100644
--- a/scenarios/invite_callforward/sipp_scenario01.xml
+++ b/scenarios/invite_callforward/sipp_scenario01.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_ignore_allowip/sipp_scenario00.xml b/scenarios/invite_ignore_allowip/sipp_scenario00.xml
index 9057392c..5434e8e2 100644
--- a/scenarios/invite_ignore_allowip/sipp_scenario00.xml
+++ b/scenarios/invite_ignore_allowip/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_offline/sipp_scenario00.xml b/scenarios/invite_offline/sipp_scenario00.xml
index d06e2645..5c87fd72 100644
--- a/scenarios/invite_offline/sipp_scenario00.xml
+++ b/scenarios/invite_offline/sipp_scenario00.xml
@@ -31,6 +31,8 @@
   
   <recv response="407" rtd="2" auth="true"/>
   
+  <pause milliseconds="500"/>
+
   <send>
     <![CDATA[
 
@@ -47,6 +49,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
@@ -85,7 +89,7 @@
   <recv response="480" rrs="true" rtd="3">
   </recv>
 
-<send>
+  <send>
     <![CDATA[
 
       ACK sip:[field0 file="callee.csv" line=0]@[field3 file="callee.csv" line=0]:[remote_port] SIP/2.0
@@ -101,6 +105,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
@@ -139,7 +145,7 @@
   <recv response="480" rrs="true" rtd="3">
   </recv>
 
-<send>
+  <send>
     <![CDATA[
 
       ACK sip:[field1 file="callee.csv" line=0]@[field3 file="callee.csv" line=0]:[remote_port] SIP/2.0
diff --git a/scenarios/invite_peerout/sipp_scenario00.xml b/scenarios/invite_peerout/sipp_scenario00.xml
index 9057392c..5434e8e2 100644
--- a/scenarios/invite_peerout/sipp_scenario00.xml
+++ b/scenarios/invite_peerout/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_peerout_rewrite/sipp_scenario00.xml b/scenarios/invite_peerout_rewrite/sipp_scenario00.xml
index 9057392c..5434e8e2 100644
--- a/scenarios/invite_peerout_rewrite/sipp_scenario00.xml
+++ b/scenarios/invite_peerout_rewrite/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_speeddial/sipp_scenario00.xml b/scenarios/invite_speeddial/sipp_scenario00.xml
index 8aae0cf1..5702b578 100644
--- a/scenarios/invite_speeddial/sipp_scenario00.xml
+++ b/scenarios/invite_speeddial/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_speeddial/sipp_scenario01.xml b/scenarios/invite_speeddial/sipp_scenario01.xml
index 1c88e64b..a1f5ce7b 100644
--- a/scenarios/invite_speeddial/sipp_scenario01.xml
+++ b/scenarios/invite_speeddial/sipp_scenario01.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_speeddial/sipp_scenario02.xml b/scenarios/invite_speeddial/sipp_scenario02.xml
index b03ff585..03f5e326 100644
--- a/scenarios/invite_speeddial/sipp_scenario02.xml
+++ b/scenarios/invite_speeddial/sipp_scenario02.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/invite_speeddial/sipp_scenario03.xml b/scenarios/invite_speeddial/sipp_scenario03.xml
index f22e26b5..3eee023e 100644
--- a/scenarios/invite_speeddial/sipp_scenario03.xml
+++ b/scenarios/invite_speeddial/sipp_scenario03.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[
 
diff --git a/scenarios/reminder/sipp_scenario00.xml b/scenarios/reminder/sipp_scenario00.xml
index 85bf3cd2..d59540b3 100644
--- a/scenarios/reminder/sipp_scenario00.xml
+++ b/scenarios/reminder/sipp_scenario00.xml
@@ -48,6 +48,8 @@
     ]]>
   </send>
 
+  <pause milliseconds="500"/>
+
   <send start_rtd="3">
     <![CDATA[