diff --git a/jenkins-common.sh b/jenkins-common.sh
index ef0a3fc6..a607f9a3 100644
--- a/jenkins-common.sh
+++ b/jenkins-common.sh
@@ -262,6 +262,35 @@ network_remove() {
 	docker network remove $NET_NAME
 }
 
+# Clean and remove all docker networks related to ttcn3 testing. This prevents
+# running testsuites in parallel, so usually we don't want this and rely on the
+# clean_up_trap to clean the network. But on e.g. gtp0-deb10fr this gets used
+# as we only run one testsuite at once and it has dahdi netdevices attached.
+# Due connection loss, it may not be cleaned up there and so another testsuite
+# cannot start.
+network_clean_remove_all_ttcn3() {
+	local networks
+	local i
+
+	networks="$(docker network ls --format '{{.Name}}' | grep ^ttcn3- || true)"
+
+	if [ -z "$networks" ]; then
+		return
+	fi
+
+	set +x
+	echo "Removing stale network and containers..."
+	set -x
+
+	for i in $networks; do
+		NET_NAME="$i"
+		network_clean
+		network_remove
+	done
+
+	unset NET_NAME
+}
+
 network_replace_subnet_in_configs() {
 	set +x
 
diff --git a/ttcn3-fr-test/jenkins.sh b/ttcn3-fr-test/jenkins.sh
index 91220635..12e14a5e 100755
--- a/ttcn3-fr-test/jenkins.sh
+++ b/ttcn3-fr-test/jenkins.sh
@@ -30,6 +30,7 @@ cp FRNET_Tests.cfg $VOL_BASE_DIR/frnet/
 
 mkdir $VOL_BASE_DIR/unix
 
+network_clean_remove_all_ttcn3
 network_create
 network_replace_subnet_in_configs
 
diff --git a/ttcn3-gbproxy-test-fr/jenkins.sh b/ttcn3-gbproxy-test-fr/jenkins.sh
index ab62bc10..1c53173e 100755
--- a/ttcn3-gbproxy-test-fr/jenkins.sh
+++ b/ttcn3-gbproxy-test-fr/jenkins.sh
@@ -33,6 +33,7 @@ cp osmo-gbproxy.cfg $VOL_BASE_DIR/gbproxy/
 
 mkdir $VOL_BASE_DIR/unix
 
+network_clean_remove_all_ttcn3
 network_create
 network_replace_subnet_in_configs
 
diff --git a/ttcn3-ns-test/jenkins-fr.sh b/ttcn3-ns-test/jenkins-fr.sh
index 3b609ab6..b6af67f0 100755
--- a/ttcn3-ns-test/jenkins-fr.sh
+++ b/ttcn3-ns-test/jenkins-fr.sh
@@ -29,6 +29,7 @@ write_mp_osmo_repo "$VOL_BASE_DIR/ns-tester/NS_Tests.cfg"
 mkdir $VOL_BASE_DIR/ns
 cp fr/osmo-ns-dummy.cfg $VOL_BASE_DIR/ns/
 
+network_clean_remove_all_ttcn3
 network_create
 network_replace_subnet_in_configs