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diff --git a/src/bin/dhcp6/tests/callout_library_3.cc b/src/bin/dhcp6/tests/callout_library_3.cc
new file mode 100644
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+++ b/src/bin/dhcp6/tests/callout_library_3.cc
@@ -0,0 +1,76 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/// @file
+/// @brief Callout library for testing execution of the dhcp6_srv_configured
+/// hook point.
+///
+static const int LIBRARY_NUMBER = 3;
+#include <config.h>
+
+#include <dhcp6/tests/callout_library_common.h>
+#include <dhcpsrv/srv_config.h>
+
+#include <string>
+#include <vector>
+
+using namespace isc::hooks;
+
+// Functions accessed by the hooks framework use C linkage to avoid the name
+// mangling that accompanies use of the C++ compiler as well as to avoid
+// issues related to namespaces.
+extern "C" {
+
+/// @brief Callout which appends library number and provided arguments to
+/// the marker file for dhcp6_srv_configured callout.
+///
+/// @param handle callout handle passed to the callout.
+///
+/// @return 0 on success, 1 otherwise.
+int
+dhcp6_srv_configured(CalloutHandle& handle) {
+    // Append library number.
+    if (appendDigit(SRV_CONFIG_MARKER_FILE)) {
+        return (1);
+    }
+
+    // Append argument names.
+    std::vector<std::string> args = handle.getArgumentNames();
+    for (auto arg = args.begin(); arg != args.end(); ++arg) {
+        if (appendArgument(SRV_CONFIG_MARKER_FILE, arg->c_str()) != 0) {
+            return (1);
+        }
+    }
+
+    // Determine if this callout is configured to fail.
+    isc::dhcp::SrvConfigPtr config;
+    handle.getArgument("server_config", config);
+    isc::data::ConstElementPtr mode_element(config ? config->toElement() ?
+        config->toElement()->find("Dhcp6/hooks-libraries") ?
+        config->toElement()->find("Dhcp6/hooks-libraries")->get(0) ?
+        config->toElement()->find("Dhcp6/hooks-libraries")->get(0)->get("parameters") ?
+        config->toElement()->find("Dhcp6/hooks-libraries")->get(0)->get("parameters")->get("mode")
+        : 0 : 0 : 0 : 0 : 0);
+    std::string mode(mode_element ? mode_element->stringValue() : "");
+    if (mode == "fail-without-error") {
+        handle.setStatus(CalloutHandle::NEXT_STEP_DROP);
+    } else if (mode == "fail-with-error") {
+        std::string error("user explicitly configured me to fail");
+        handle.setArgument("error", error);
+        handle.setStatus(CalloutHandle::NEXT_STEP_DROP);
+    }
+
+    return (0);
+}
+
+/// @brief This function is called to retrieve the multi-threading compatibility.
+///
+/// @return 0 which means not compatible with multi-threading.
+int multi_threading_compatible() {
+    return (0);
+}
+
+} // end extern "C"