diff --git a/res/res_rtp_asterisk.c b/res/res_rtp_asterisk.c
index 2730611247194132b5d92615c68c12a38fe9b59b..5aeb791d324de9d0134bac8109a158fbffc32c0c 100644
--- a/res/res_rtp_asterisk.c
+++ b/res/res_rtp_asterisk.c
@@ -140,7 +140,14 @@ enum strict_rtp_state {
 	STRICT_RTP_CLOSED,   /*! Drop all RTP packets not coming from source that was learned */
 };
 
-#define STRICT_RTP_LEARN_TIMEOUT	1500	/*!< milliseconds */
+/*!
+ * \brief Strict RTP learning timeout time in milliseconds
+ *
+ * \note Set to 5 seconds to allow reinvite chains for direct media
+ * to settle before media actually starts to arrive.  There may be a
+ * reinvite collision involved on the other leg.
+ */
+#define STRICT_RTP_LEARN_TIMEOUT	5000
 
 #define DEFAULT_STRICT_RTP -1	/*!< Enabled */
 #define DEFAULT_ICESUPPORT 1