diff --git a/bin/check.sh b/bin/check.sh
index 031c4cd1..6bc473c1 100755
--- a/bin/check.sh
+++ b/bin/check.sh
@@ -85,8 +85,8 @@ function run_sipp
   ${BIN_DIR}/restart_log.sh
   for res in $(find ${SCEN_CHECK_DIR} -type f -name 'sipp_scenario_responder[0-9][0-9].xml'| sort); do
     base=$(basename $res .xml)
-    ${BIN_DIR}/sipp.sh -d ${DOMAIN} -r ${SCEN_CHECK_DIR}/${base}_reg.xml &> /dev/null
-    ${BIN_DIR}/sipp.sh -d ${DOMAIN} -r ${SCEN_CHECK_DIR}/${base}.xml &> /dev/null &
+    ${BIN_DIR}/sipp.sh -d ${DOMAIN} -r ${SCEN_CHECK_DIR}/${base}_reg.xml
+    ${BIN_DIR}/sipp.sh -d ${DOMAIN} -r ${SCEN_CHECK_DIR}/${base}.xml &
     responder_pid="${responder_pid} ${base}:$!"
   done
   status=0
@@ -108,7 +108,7 @@ function run_sipp
       echo "sipp responder $base pid $pid not finished yet. Waiting 5 secs"
       sleep 5
     fi
-    ${BIN_DIR}/sipp.sh -d ${DOMAIN} -r ${SCEN_CHECK_DIR}/${base}_unreg.xml &> /dev/null
+    ${BIN_DIR}/sipp.sh -d ${DOMAIN} -r ${SCEN_CHECK_DIR}/${base}_unreg.xml
   done
 
   # copy the kamailio log
diff --git a/bin/sipp.sh b/bin/sipp.sh
index 430feda3..105d47e6 100755
--- a/bin/sipp.sh
+++ b/bin/sipp.sh
@@ -62,13 +62,13 @@ if [ -z ${RESP} ]; then
   PORT=${PORT:-"50602"}
   TIMEOUT=${TIMEOUT:-"10"}
   sipp -max_socket $MAX -inf ${BASE_DIR}/../callee.csv -inf ${BASE_DIR}/../caller.csv -sf $1 -i $IP \
-    -nd -t ul -p $PORT $IP -m 1 -mp ${MPORT} -timeout ${TIMEOUT} -timeout_error -trace_err
+    -nd -t ul -p $PORT $IP -m 1 -mp ${MPORT} -timeout ${TIMEOUT} -timeout_error -trace_err &> /dev/null
 else
   MPORT=${PORT:-"6003"}
   PORT=${PORT:-"50603"}
   TIMEOUT=${TIMEOUT:-"25"}
   sipp -max_socket $MAX -inf ${BASE_DIR}/../callee.csv -sf $1 -i $IP \
-    -nd -t ul -p $PORT $IP -m 1 -rtp_echo -mp ${MPORT} -timeout ${TIMEOUT} -timeout_error -trace_err
+    -nd -t ul -p $PORT $IP -m 1 -rtp_echo -mp ${MPORT} -timeout ${TIMEOUT} -timeout_error -trace_err &> /dev/null
 fi
 
 set_domain 0