diff -urNp openser-1.1.0-notls/modules/nathelper/doc/nathelper_user.sgml openser-1.1.0-notls-nortpproxy_str/modules/nathelper/doc/nathelper_user.sgml
--- openser-1.1.0-notls/modules/nathelper/doc/nathelper_user.sgml	2006-06-07 15:29:07.000000000 +0200
+++ openser-1.1.0-notls-nortpproxy_str/modules/nathelper/doc/nathelper_user.sgml	2006-09-01 20:31:53.000000000 +0200
@@ -344,6 +344,26 @@ modparam("nathelper", "sipping_method", 
 </programlisting>
 		</example>
 	</section>
+	<section>
+		<title><varname>nortpproxy_str</varname> (string)</title>
+		<para>
+		The parameter sets the SDP attribute used by nathelper to mark
+		the packet SDP informations have already been mangled.
+		</para>
+		<para>
+		<emphasis>
+			Default value is <quote>a=nortpproxy:yes\r\n</quote>.
+		</emphasis>
+		</para>
+		<example>
+		<title>Set <varname>nortpproxy_str</varname> parameter</title>
+		<programlisting format="linespecific">
+...
+modparam("nathelper", "nortpproxy_str", "a=sdpmangled:yes")
+...
+</programlisting>
+		</example>
+	</section>
 	</section>
 
 
diff -urNp openser-1.1.0-notls/modules/nathelper/nathelper.c openser-1.1.0-notls-nortpproxy_str/modules/nathelper/nathelper.c
--- openser-1.1.0-notls/modules/nathelper/nathelper.c	2006-06-07 15:52:44.000000000 +0200
+++ openser-1.1.0-notls-nortpproxy_str/modules/nathelper/nathelper.c	2006-09-01 20:31:47.000000000 +0200
@@ -286,6 +286,15 @@ static pid_t mypid;
 static unsigned int myseqn = 0;
 static int rcv_avp_no = 42;
 
+/*
+ * This should have been defined right above replace_sdp_ip() but
+ * it is needed here.
+ */
+#define	ANORTPPROXY	"a=nortpproxy:yes\r\n"
+#define	ANORTPPROXY_LEN	(sizeof(ANORTPPROXY) - 1)
+static str nortpproxy_str = { ANORTPPROXY, ANORTPPROXY_LEN };
+static char *nortpproxy = NULL;
+
 
 struct rtpp_head {
 	struct rtpp_node	*rn_first;
@@ -336,6 +345,7 @@ static cmd_export_t cmds[] = {
 static param_export_t params[] = {
 	{"natping_interval",      INT_PARAM, &natping_interval      },
 	{"ping_nated_only",       INT_PARAM, &ping_nated_only       },
+	{"nortpproxy_str",        STR_PARAM, &nortpproxy            },
 	{"rtpproxy_sock",         STR_PARAM, &rtpproxy_sock         },
 	{"rtpproxy_disable",      INT_PARAM, &rtpproxy_disable      },
 	{"rtpproxy_disable_tout", INT_PARAM, &rtpproxy_disable_tout },
@@ -400,6 +410,11 @@ mod_init(void)
 		force_socket=grep_sock_info(&socket_str,0,0);
 	}
 
+	if (nortpproxy != NULL) {
+		nortpproxy_str.s = nortpproxy;
+		nortpproxy_str.len = strlen(nortpproxy);
+	}
+
 	if (natping_interval > 0) {
 		bind_usrloc = (bind_usrloc_t)find_export("ul_bind_usrloc", 1, 0);
 		if (!bind_usrloc) {
@@ -936,9 +951,6 @@ nat_uac_test_f(struct sip_msg* msg, char
 #define	AOLDMEDPRT	"a=oldmediaport:"
 #define	AOLDMEDPRT_LEN	(sizeof(AOLDMEDPRT) - 1)
 
-#define	ANORTPPROXY	"a=nortpproxy:yes\r\n"
-#define	ANORTPPROXY_LEN	(sizeof(ANORTPPROXY) - 1)
-
 
 static inline int 
 replace_sdp_ip(struct sip_msg* msg, str *org_body, char *line, str *ip)
@@ -1031,13 +1043,13 @@ fix_nated_sdp_f(struct sip_msg* msg, cha
 			}
 		}
 		if (level & ADD_ANORTPPROXY) {
-			buf = pkg_malloc(ANORTPPROXY_LEN * sizeof(char));
+			buf = pkg_malloc(nortpproxy_str.len * sizeof(char));
 			if (buf == NULL) {
 				LOG(L_ERR, "ERROR: fix_nated_sdp: out of memory\n");
 				return -1;
 			}
-			memcpy(buf, ANORTPPROXY, ANORTPPROXY_LEN);
-			if (insert_new_lump_after(anchor, buf, ANORTPPROXY_LEN, 0)==NULL) {
+			memcpy(buf, nortpproxy_str.s, nortpproxy_str.len);
+			if (insert_new_lump_after(anchor, buf, nortpproxy_str.len, 0)==NULL) {
 				LOG(L_ERR, "ERROR: fix_nated_sdp: insert_new_lump_after "
 					"failed\n");
 				pkg_free(buf);
@@ -1811,15 +1823,15 @@ force_rtp_proxy2_f(struct sip_msg* msg, 
 		to_tag = tmp;
 	}
 	proxied = 0;
-	for (cp = body.s; (len = body.s + body.len - cp) >= ANORTPPROXY_LEN;) {
-		cp1 = ser_memmem(cp, ANORTPPROXY, len, ANORTPPROXY_LEN);
+	for (cp = body.s; (len = body.s + body.len - cp) >= nortpproxy_str.len;) {
+		cp1 = ser_memmem(cp, nortpproxy_str.s, len, nortpproxy_str.len);
 		if (cp1 == NULL)
 			break;
 		if (cp1[-1] == '\n' || cp1[-1] == '\r') {
 			proxied = 1;
 			break;
 		}
-		cp = cp1 + ANORTPPROXY_LEN;
+		cp = cp1 + nortpproxy_str.len;
 	}
 	if (proxied != 0 && force == 0)
 		return -1;
@@ -2037,7 +2049,7 @@ force_rtp_proxy2_f(struct sip_msg* msg, 
 	} /* Iterate sessions */
 
 	if (proxied == 0) {
-		cp = pkg_malloc(ANORTPPROXY_LEN * sizeof(char));
+		cp = pkg_malloc(nortpproxy_str.len * sizeof(char));
 		if (cp == NULL) {
 			LOG(L_ERR, "ERROR: force_rtp_proxy2: out of memory\n");
 			return -1;
@@ -2048,8 +2060,8 @@ force_rtp_proxy2_f(struct sip_msg* msg, 
 			pkg_free(cp);
 			return -1;
 		}
-		memcpy(cp, ANORTPPROXY, ANORTPPROXY_LEN);
-		if (insert_new_lump_after(anchor, cp, ANORTPPROXY_LEN, 0) == NULL) {
+		memcpy(cp, nortpproxy_str.s, nortpproxy_str.len);
+		if (insert_new_lump_after(anchor, cp, nortpproxy_str.len, 0) == NULL) {
 			LOG(L_ERR, "ERROR: force_rtp_proxy2: insert_new_lump_after failed\n");
 			pkg_free(cp);
 			return -1;