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diff --git a/third_party/libsrtp/src/test/ut_sim.h b/third_party/libsrtp/src/test/ut_sim.h
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+/*
+ * ut-sim.h
+ *
+ * an unreliable transport simulator
+ * (for testing replay databases and suchlike)
+ *
+ * David A. McGrew
+ * Cisco Systems, Inc.
+ */
+
+/*
+ *
+ * Copyright (c) 2001-2017, Cisco Systems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ *   Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ *   Neither the name of the Cisco Systems, Inc. nor the names of its
+ *   contributors may be used to endorse or promote products derived
+ *   from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef UT_SIM_H
+#define UT_SIM_H
+
+#include "integers.h" /* for uint32_t */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define UT_BUF 160 /* maximum amount of packet reorder */
+
+typedef struct {
+    uint32_t index;
+    uint32_t buffer[UT_BUF];
+} ut_connection;
+
+/*
+ * ut_init(&u) initializes the ut_connection
+ *
+ * this function should always be the first one called on a new
+ * ut_connection
+ */
+
+void ut_init(ut_connection *utc);
+
+/*
+ * ut_next_index(&u) returns the next index from the simulated
+ * unreliable connection
+ */
+
+uint32_t ut_next_index(ut_connection *utc);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* UT_SIM_H */