Index: asterisk-11.21.0-rc1/res/res_rtp_asterisk.c
===================================================================
--- asterisk-11.21.0-rc1.orig/res/res_rtp_asterisk.c	2015-12-24 11:02:25.000000000 +0000
+++ asterisk-11.21.0-rc1/res/res_rtp_asterisk.c	2015-12-24 11:02:25.000000000 +0000
@@ -1950,7 +1950,10 @@
 		}
 
 		out = BIO_read(dtls->write_bio, outgoing, sizeof(outgoing));
+		
+		ast_mutex_unlock(&dtls->lock);
 		__rtp_sendto(instance, outgoing, out, 0, &remote_address, rtcp, &ice, 0);
+		ast_mutex_lock(&dtls->lock);
 	}
 }
 
@@ -1959,15 +1962,15 @@
 	struct ast_rtp_instance *instance = (struct ast_rtp_instance *)data;
 	struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
 
+	/* TODO: No DTLS lock necessary??? */
 	SSL_renegotiate(rtp->dtls.ssl);
 	SSL_do_handshake(rtp->dtls.ssl);
-	dtls_srtp_check_pending(instance, rtp, 0);
 
 	if (rtp->rtcp && rtp->rtcp->dtls.ssl) {
 		SSL_renegotiate(rtp->rtcp->dtls.ssl);
 		SSL_do_handshake(rtp->rtcp->dtls.ssl);
-		dtls_srtp_check_pending(instance, rtp, 1);
 	}
+	dtls_srtp_flush_pending(instance, rtp);
 
 	rtp->rekeyid = -1;
 	ao2_ref(instance, -1);