--- res/res_srtp.c (revision 388769)
+++ res/res_srtp.c (working copy)
@@ -48,6 +48,9 @@
 #include "asterisk/rtp_engine.h"
 #include "asterisk/astobj2.h"
 
+#include <srtp/srtp_priv.h>
+#include <srtp/datatypes.h>
+
 struct ast_srtp {
 	struct ast_rtp_instance *rtp;
 	struct ao2_container *policies;
@@ -401,9 +404,33 @@
 		return -1;
 	}
 
+	/* debug part */
+	if (buf) {
+		srtp_hdr_t *hdr = (srtp_hdr_t *) buf;
+		srtp_stream_ctx_t *stream = srtp_get_stream(srtp->session, hdr->ssrc);
+		if (stream) {
+			rdbx_t *rdbx = &stream->rtp_rdbx;
+			if (rdbx) {
+				xtd_seq_num_t *pi = &rdbx->index;
+				if (pi) {
+					if (res == err_status_auth_fail) {
+						ast_log(AST_LOG_NOTICE, "SRTP unprotect gave %s, ROC 0x%012lx SEQ %i\n", srtp_errstr(res), stream->rtp_rdbx.index, ntohs(hdr->seq));
+						//stream->rtp_services = sec_serv_conf; /* uncomment to turn-off authentication-check */
+					} else if (0x0000 == ntohs(hdr->seq)) {
+						ast_log(AST_LOG_NOTICE, "SRTP unprotect gave %s, ROC 0x%012lx SEQ %i\n", srtp_errstr(res), stream->rtp_rdbx.index, ntohs(hdr->seq));
+					}
+				}
+			}
+		}
+	} /* end of debug */
+
 	if (res != err_status_ok && res != err_status_replay_fail ) {
 		if ((srtp->warned >= 10) && !((srtp->warned - 10) % 100)) {
-			ast_log(AST_LOG_WARNING, "SRTP unprotect failed with: %s %d\n", srtp_errstr(res), srtp->warned);
+			if (rtcp) {
+				ast_log(AST_LOG_WARNING, "SRTcP unprotect failed with: %s %d\n", srtp_errstr(res), srtp->warned);
+			} else {
+				ast_log(AST_LOG_WARNING, "SRTP unprotect failed with: %s %d\n", srtp_errstr(res), srtp->warned);
+			}
 			srtp->warned = 11;
 		} else {
 			srtp->warned++;
--- res/res_rtp_asterisk.c (revision 401620)
+++ res/res_rtp_asterisk.c (working copy)
@@ -1779,7 +1779,7 @@
 
 	/* Set default parameters on the newly created RTP structure */
 	rtp->ssrc = ast_random();
-	rtp->seqno = ast_random() & 0xffff;
+	rtp->seqno = 65285; /* sequence number (SEQ) wraps after five seconds, roll over counter (ROC) gets increased */
 	rtp->strict_rtp_state = (strictrtp ? STRICT_RTP_LEARN : STRICT_RTP_OPEN);
 	if (strictrtp) {
 		rtp_learning_seq_init(&rtp->rtp_source_learn, (uint16_t)rtp->seqno);
@@ -3732,8 +3732,10 @@
 			ast_log(LOG_WARNING, "scheduling RTCP transmission failed.\n");
 		}
 	}
-	if ((int)rtp->lastrxseqno - (int)seqno  > 100) /* if so it would indicate that the sender cycled; allow for misordering */
+	if ((int)rtp->lastrxseqno - (int)seqno  > 100) { /* if so it would indicate that the sender cycled; allow for misordering */		
 		rtp->cycles += RTP_SEQ_MOD;
+		ast_log(LOG_NOTICE, "RTP-ROC %i, current/received RTP-SEQ %i, last seen/received RTP-SEQ %i\n", rtp->cycles >> 16, seqno, rtp->lastrxseqno);
+	}
 
 	prev_seqno = rtp->lastrxseqno;
 	rtp->lastrxseqno = seqno;