diff --git a/scenarios/invite_blockout_blst/0001_test.yml.tt2 b/scenarios/invite_blockout_blst/0001_test.yml.tt2
index 837effb4..93b3f6f2 100644
--- a/scenarios/invite_blockout_blst/0001_test.yml.tt2
+++ b/scenarios/invite_blockout_blst/0001_test.yml.tt2
@@ -22,7 +22,7 @@ flow:
   - exit|ROUTE_EXIT:
 sip_in:
   - '^INVITE'
-  - 'Contact: sip:testuser1002@'
+  - 'Contact: <sip:[% scenarios.0.username %]@[% scenarios.0.ip %]:[% scenarios.0.port %](;[^>]+)?>'
   - 'CSeq: 1 INVITE'
   - 'Max-Forwards: 69'
   - 'Content-Type: application/sdp'
diff --git a/scenarios/invite_blockout_blst/0003_test.yml.tt2 b/scenarios/invite_blockout_blst/0003_test.yml.tt2
index 2bb63a17..8a71f1d4 100644
--- a/scenarios/invite_blockout_blst/0003_test.yml.tt2
+++ b/scenarios/invite_blockout_blst/0003_test.yml.tt2
@@ -109,7 +109,7 @@ flow:
   - exit|ROUTE_EXIT:
 sip_in:
   - '^INVITE'
-  - 'Contact: sip:testuser1002@'
+  - 'Contact: <sip:[% scenarios.0.username %]@[% scenarios.0.ip %]:[% scenarios.0.port %](;[^>]+)?>'
   - 'CSeq: 2 INVITE'
   - 'Max-Forwards: 69'
   - 'Content-Type: application/sdp'
diff --git a/scenarios/invite_blockout_blst/sipp_scenario00.xml b/scenarios/invite_blockout_blst/sipp_scenario00.xml
index 3aa49c59..9d84a76f 100644
--- a/scenarios/invite_blockout_blst/sipp_scenario00.xml
+++ b/scenarios/invite_blockout_blst/sipp_scenario00.xml
@@ -10,7 +10,7 @@
       To: <sip:[field1 file="callee.csv" line=0]@[field3 file="callee.csv" line=0]>
       Call-ID: NGCP%[field4 file="callee.csv" line=0]%///[call_id]
       CSeq: 1 INVITE
-      Contact: sip:[field0 file="caller.csv" line=0]@[local_ip]:[local_port]
+      Contact: <sip:[field0 file="caller.csv" line=0]@[local_ip]:[local_port]>
       Max-Forwards: 70
       Content-Type: application/sdp
       Content-Length: [len]
@@ -41,7 +41,7 @@
       To: <sip:[field1 file="callee.csv" line=0]@[field3 file="callee.csv" line=0]>[peer_tag_param]
       Call-ID: NGCP%[field4 file="callee.csv" line=0]%///[call_id]
       CSeq: 1 ACK
-      Contact: sip:[field0 file="caller.csv" line=0]@[local_ip]:[local_port]
+      Contact: <sip:[field0 file="caller.csv" line=0]@[local_ip]:[local_port]>
       Max-Forwards: 70
       Content-Length: 0
 
@@ -59,7 +59,7 @@
       To: <sip:[field1 file="callee.csv" line=0]@[field3 file="callee.csv" line=0]>
       Call-ID: NGCP%[field4 file="callee.csv" line=0]%///[call_id]
       CSeq: 2 INVITE
-      Contact: sip:[field0 file="caller.csv" line=0]@[local_ip]:[local_port]
+      Contact: <sip:[field0 file="caller.csv" line=0]@[local_ip]:[local_port]>
       Max-Forwards: 70
       [field1 file="caller.csv" line=0]
       Content-Type: application/sdp
@@ -92,7 +92,7 @@
       To: <sip:[field1 file="callee.csv" line=0]@[field3 file="callee.csv" line=0]>[peer_tag_param]
       Call-ID: NGCP%[field4 file="callee.csv" line=0]%///[call_id]
       CSeq: 2 ACK
-      Contact: sip:[field0 file="caller.csv" line=0]@[local_ip]:[local_port]
+      Contact: <sip:[field0 file="caller.csv" line=0]@[local_ip]:[local_port]>
       Max-Forwards: 70
       Content-Length: 0