diff --git a/debian/patches/series b/debian/patches/series
index 4a0e4c7f1..845a4b7c0 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -41,6 +41,7 @@ upstream/pv_headers-pvh_set_header-remove-values-to-set-null-.patch
 upstream/pv_headers-don-t-try-to-replace-header.patch
 upstream/permissions-don-t-remove-old-data-at-the-end-of-the-.patch
 upstream/permissions-trusted_cleanup_interval.patch
+upstream/nathelper-fix_nated_sdp-added-ignoring-RFC3605-param.patch
 ### relevant for upstream
 sipwise/pua_dialoginfo-refresh_pubruri_avps_flag.patch
 sipwise/pua_dialoginfo-local_identity_dlg_var.patch
diff --git a/debian/patches/upstream/nathelper-fix_nated_sdp-added-ignoring-RFC3605-param.patch b/debian/patches/upstream/nathelper-fix_nated_sdp-added-ignoring-RFC3605-param.patch
new file mode 100644
index 000000000..a8951c5a7
--- /dev/null
+++ b/debian/patches/upstream/nathelper-fix_nated_sdp-added-ignoring-RFC3605-param.patch
@@ -0,0 +1,112 @@
+From: Dmitry Wagin <dmitry.wagin@ya.ru>
+Date: Tue, 15 Jun 2021 15:58:12 +0300
+Subject: nathelper: fix_nated_sdp added ignoring RFC3605-param if omitted
+
+- doesn't throw an error while "a=rtcp" param is omitted (RFC1889 behavior) or address is omitted
+- replace_sdp_ip() returns 0 on omitted IP-address
+- added param can_omit to replace_sdp_ip()
+---
+ src/modules/nathelper/nathelper.c | 37 ++++++++++++++++++-------------------
+ 1 file changed, 18 insertions(+), 19 deletions(-)
+
+diff --git a/src/modules/nathelper/nathelper.c b/src/modules/nathelper/nathelper.c
+index 1392a0a..9e45a61 100644
+--- a/src/modules/nathelper/nathelper.c
++++ b/src/modules/nathelper/nathelper.c
+@@ -1609,13 +1609,12 @@ static int is_rfc1918_f(struct sip_msg *msg, char *str1, char *str2)
+ #define AOLDMEDPRT_LEN (sizeof(AOLDMEDPRT) - 1)
+ 
+ 
+-/* replace ip addresses in SDP and return umber of replacements */
++/* replace ip addresses in SDP and return number of replacements */
+ static inline int replace_sdp_ip(
+-		struct sip_msg *msg, str *org_body, char *line, str *ip, int linelen)
++		struct sip_msg *msg, str *org_body, char *line, str *ip, int linelen, int can_omit)
+ {
+ 	str body1, oldip, newip;
+ 	str body = *org_body;
+-	unsigned hasreplaced = 0;
+ 	int pf, pf1 = 0;
+ 	str body2;
+ 	char *bodylimit = body.s + body.len;
+@@ -1631,10 +1630,17 @@ static inline int replace_sdp_ip(
+ 	}
+ 	body1 = body;
+ 	for(;;) {
+-		if(nh_extract_mediaip(&body1, &oldip, &pf, line, linelen) == -1)
++		ret = nh_extract_mediaip(&body1, &oldip, &pf, line, linelen);
++		if(ret == 0)
+ 			break;
+-		if(pf != AF_INET) {
+-			LM_ERR("not an IPv4 address in '%s' SDP\n", line);
++		if(ret == -1) {
++			if(can_omit) {
++				body2.s = body1.s + linelen;
++				body2.len = bodylimit - body2.s;
++				body1 = body2;
++				continue;
++			}
++			LM_ERR("no `IP[4|6]' in `%s' field\n", line);
+ 			return -1;
+ 		}
+ 		if(!pf1)
+@@ -1652,13 +1658,8 @@ static inline int replace_sdp_ip(
+ 			return -1;
+ 		}
+ 		count += ret;
+-		hasreplaced = 1;
+ 		body1 = body2;
+ 	}
+-	if(!hasreplaced && linelen>=6 && memcmp("a=rtcp", line, 6)!=0) {
+-		LM_ERR("can't extract '%s' IP from the SDP\n", line);
+-		return -1;
+-	}
+ 
+ 	return count;
+ }
+@@ -1737,15 +1738,14 @@ static int ki_fix_nated_sdp_ip(sip_msg_t *msg, int level, str *ip)
+ 	if(level & (FIX_MEDIP | FIX_ORGIP)) {
+ 
+ 		/* Iterate all a=rtcp and replace ips in them. rfc3605 */
+-		ret = replace_sdp_ip(msg, &body, "a=rtcp", (ip && ip->len>0) ? ip : 0, 6);
++		ret = replace_sdp_ip(msg, &body, "a=rtcp", (ip && ip->len>0) ? ip : 0, 6, 1);
+ 		if(ret == -1)
+-			LM_DBG("a=rtcp parameter does not exist. nothing to do.\n");
+-		else 
+-			count += ret;
++			return -1;
++		count += ret;
+ 
+ 		if(level & FIX_MEDIP) {
+ 			/* Iterate all c= and replace ips in them. */
+-			ret = replace_sdp_ip(msg, &body, "c=", (ip && ip->len>0) ? ip : 0, 2);
++			ret = replace_sdp_ip(msg, &body, "c=", (ip && ip->len>0) ? ip : 0, 2, 0);
+ 			if(ret == -1)
+ 				return -1;
+ 			count += ret;
+@@ -1753,7 +1753,7 @@ static int ki_fix_nated_sdp_ip(sip_msg_t *msg, int level, str *ip)
+ 
+ 		if(level & FIX_ORGIP) {
+ 			/* Iterate all o= and replace ips in them. */
+-			ret = replace_sdp_ip(msg, &body, "o=",  (ip && ip->len>0) ? ip : 0, 2);
++			ret = replace_sdp_ip(msg, &body, "o=",  (ip && ip->len>0) ? ip : 0, 2, 0);
+ 			if(ret == -1)
+ 				return -1;
+ 			count += ret;
+@@ -1800,7 +1800,7 @@ static int nh_extract_mediaip(str *body, str *mediaip, int *pf, char *line,
+ 		cp = cp1 + linelen;
+ 	}
+ 	if(cp1 == NULL)
+-		return -1;
++		return 0;
+ 
+ 	mediaip->s = cp1 + linelen;
+ 	mediaip->len =
+@@ -1835,7 +1835,6 @@ static int nh_extract_mediaip(str *body, str *mediaip, int *pf, char *line,
+ 		cp = eat_space_end(cp + len, mediaip->s + mediaip->len);
+ 	}
+ 	if(nextisip != 2 || mediaip->len == 0) {
+-		LM_ERR("no `IP[4|6]' in `%s' field\n", line);
+ 		return -1;
+ 	}
+ 	return 1;