diff --git a/scenarios/register_allowip/sipp_scenario00.xml b/scenarios/register_allowip/sipp_scenario00.xml
index 2ded07c1..f6d1241e 100644
--- a/scenarios/register_allowip/sipp_scenario00.xml
+++ b/scenarios/register_allowip/sipp_scenario00.xml
@@ -11,7 +11,7 @@
       To: <sip:[field0 file="callee.csv" line=0]@[field3 file="callee.csv" line=0]>
       Call-ID: [call_id]
       CSeq: 1 REGISTER
-      Contact: sip:[field0 file="callee.csv" line=0]@[local_ip]:50603
+      Contact: sip:[field0 file="callee.csv" line=0]@[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" line=0]
-      Contact: sip:[field0 file="callee.csv" line=0]@[local_ip]:50603
+      Contact: sip:[field0 file="callee.csv" line=0]@[local_ip]:[local_port]
       Expires: 600
       Max-Forwards: 70
       Content-Length: 0
diff --git a/scenarios/register_ignore_allowip/sipp_scenario00.xml b/scenarios/register_ignore_allowip/sipp_scenario00.xml
index 0192cbba..9ee32d7a 100644
--- a/scenarios/register_ignore_allowip/sipp_scenario00.xml
+++ b/scenarios/register_ignore_allowip/sipp_scenario00.xml
@@ -11,7 +11,7 @@
       To: <sip:[field0 file="callee.csv" line=0]@[field3 file="callee.csv" line=0]>
       Call-ID: [call_id]
       CSeq: 1 REGISTER
-      Contact: sip:[field0 file="callee.csv" line=0]@[local_ip]:50603
+      Contact: sip:[field0 file="callee.csv" line=0]@[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" line=0]
-      Contact: sip:[field0 file="callee.csv" line=0]@[local_ip]:50603
+      Contact: sip:[field0 file="callee.csv" line=0]@[local_ip]:[local_port]
       Expires: 600
       Max-Forwards: 70
       Content-Length: 0