--- base/usr/lib/callmonitor/modules/util.sh
+++ base/usr/lib/callmonitor/modules/util.sh
@@ -6,5 +6,6 @@
 }
 grep_re_escape() { sed_re_escape "$@"; }
 sh_escape() {
-    echo -n "'${1//'/'\''}'"
+    local escaped="'\''"
+    echo -n "'${1//\'/$escaped}'"
 }