diff --git a/openbsc/contrib/mgcp_server.py b/openbsc/contrib/mgcp_server.py
index 88963f3..ae8a6e2 100755
--- a/openbsc/contrib/mgcp_server.py
+++ b/openbsc/contrib/mgcp_server.py
@@ -25,15 +25,24 @@
 
 server_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
 server_socket.bind(("127.0.0.1", MGCP_CALLAGENT_PORT))
-server_socket.setblocking(0)
+server_socket.setblocking(1)
 
-
-def send_receive(packet):
+last_ci = 1
+def send_and_receive(packet):
+    global last_ci
     server_socket.sendto(packet, ("127.0.0.1", MGCP_GATEWAY_PORT))
     try:
         data, addr = server_socket.recvfrom(4096)
+
+        # attempt to store the CI of the response
+        list = data.split("\n")
+        for item in list:
+           if item.startswith("I: "):
+               last_ci = int(item[3:])
+
         print hexdump(data), addr
-    except socket.error:
+    except socket.error, e:
+        print e
         pass
 
 def generate_tid():
@@ -42,13 +51,10 @@
 
 
 
-i = 1
 while True:
-    send_receive(rsip_resp)
-    send_receive(audit_packet % generate_tid())
-    send_receive(crcx_packet % generate_tid() )
-    send_receive(mdcx_packet % (generate_tid(), i))
-    send_receive(dlcx_packet % (generate_tid(), i))
-    i = i + 1
+    send_and_receive(audit_packet % generate_tid())
+    send_and_receive(crcx_packet % generate_tid() )
+    send_and_receive(mdcx_packet % (generate_tid(), last_ci))
+    send_and_receive(dlcx_packet % (generate_tid(), last_ci))
 
     time.sleep(3)