--- third-party/pjproject/patches/config_site.h	(Asterisk 13.8.0)
+++ third-party/pjproject/patches/config_site.h	(working copy)
@@ -82,3 +82,11 @@
 #define	PJMEDIA_MAX_SDP_BANDW   4
 #define	PJMEDIA_MAX_SDP_ATTR   (PJMEDIA_MAX_SDP_FMT*2 + 4)
 #define	PJMEDIA_MAX_SDP_MEDIA   16
+
+/*
+ * Turn off the periodic sending of CRLNCRLN. Default is on (90 seconds),
+ * which conflicts with the keep_alive_interval in pjsip.conf of the module
+ * res_pjsip_transport_management.
+ */
+#define PJSIP_TCP_KEEP_ALIVE_INTERVAL	0
+#define PJSIP_TLS_KEEP_ALIVE_INTERVAL	0