diff --git a/bin/check.sh b/bin/check.sh
index 5b63706a..8e15eab9 100755
--- a/bin/check.sh
+++ b/bin/check.sh
@@ -154,11 +154,11 @@ if [[ $# != 1 ]]; then
 fi
 
 NAME_CHECK="$1"
-BASE_DIR="/usr/local/src/kamailio-config-tests"
+BASE_DIR="${BASE_DIR:-/usr/local/src/kamailio-config-tests}"
 BIN_DIR="${BASE_DIR}/bin"
 LOG_DIR="${BASE_DIR}/log/${NAME_CHECK}"
 RESULT_DIR="${BASE_DIR}/result/${NAME_CHECK}"
-KAM_LOG="/var/log/ngcp/kamailio-proxy.log"
+KAM_LOG="${KAM_LOG:-/var/log/ngcp/kamailio-proxy.log}"
 SCEN_DIR="${BASE_DIR}/scenarios"
 SCEN_CHECK_DIR="${SCEN_DIR}/${NAME_CHECK}"
 DOMAIN=${DOMAIN:-"spce.test"}
diff --git a/bin/generate_tests.sh b/bin/generate_tests.sh
index 85c72106..97e1c86e 100755
--- a/bin/generate_tests.sh
+++ b/bin/generate_tests.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-BASE_DIR="/usr/local/src/kamailio-config-tests"
+BASE_DIR="${BASE_DIR:-/usr/local/src/kamailio-config-tests}"
 BIN_DIR="${BASE_DIR}/bin"
 LOG_DIR="${BASE_DIR}/log"
 RESULT_DIR="${BASE_DIR}/result"
diff --git a/bin/sipp.sh b/bin/sipp.sh
index 105d47e6..1c4094fe 100755
--- a/bin/sipp.sh
+++ b/bin/sipp.sh
@@ -51,7 +51,7 @@ if [ ! -f $1 ]; then
 	usage
 	exit 1
 fi
-BASE_DIR=$(dirname $1)
+BASE_DIR="${BASE_DIR:-$(dirname $1)}"
 IP="127.0.0.1"
 DOMAIN=${DOMAIN:-"spce.test"}
 MAX="5000"
diff --git a/run_tests.sh b/run_tests.sh
index a691edfa..57e93354 100755
--- a/run_tests.sh
+++ b/run_tests.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-BASE_DIR="/usr/local/src/kamailio-config-tests"
+BASE_DIR="${BASE_DIR:-/usr/local/src/kamailio-config-tests}"
 BIN_DIR="${BASE_DIR}/bin"
 LOG_DIR="${BASE_DIR}/log"
 RESULT_DIR="${BASE_DIR}/result"