diff --git a/src/core/dset.c b/src/core/dset.c
index db2de4cfc77..faa61db72b2 100644
--- a/src/core/dset.c
+++ b/src/core/dset.c
@@ -1029,91 +1029,6 @@ int uri_restore_rcv_alias(str *uri, str *nuri, str *suri)
 	return 0;
 }
 
-
-/**
- * trim alias parameter from uri
- * - nuri->s must point to a buffer of nuri->len size
- */
-int uri_trim_rcv_alias(str *uri, str *nuri)
-{
-	char *p;
-	str skip;
-	str ip, port;
-	int proto;
-
-	if(uri == NULL || nuri == NULL) {
-		LM_ERR("invalid parameter value\n");
-		return -1;
-	}
-
-	/* sip:x;alias=1.1.1.1~0~0 */
-	if(uri->len < 23) {
-		/* no alias possible */
-		return 0;
-	}
-	p = uri->s + uri->len - 18;
-	skip.s = 0;
-	while(p > uri->s + 5) {
-		if(strncmp(p, ";alias=", 7) == 0) {
-			skip.s = p;
-			break;
-		}
-		p--;
-	}
-	if(skip.s == 0) {
-		/* alias parameter not found */
-		return 0;
-	}
-	p += 7;
-	ip.s = p;
-	p = (char *)memchr(ip.s, '~', (size_t)(uri->s + uri->len - ip.s));
-	if(p == NULL) {
-		/* proper alias parameter not found */
-		return 0;
-	}
-	ip.len = p - ip.s;
-	p++;
-	if(p >= uri->s + uri->len) {
-		/* proper alias parameter not found */
-		return 0;
-	}
-	port.s = p;
-	p = (char *)memchr(port.s, '~', (size_t)(uri->s + uri->len - port.s));
-	if(p == NULL) {
-		/* proper alias parameter not found */
-		return 0;
-	}
-	port.len = p - port.s;
-	p++;
-	if(p >= uri->s + uri->len) {
-		/* proper alias parameter not found */
-		return 0;
-	}
-	proto = (int)(*p - '0');
-	p++;
-
-	if(p != uri->s + uri->len && *p != ';') {
-		/* proper alias parameter not found */
-		return 0;
-	}
-	skip.len = (int)(p - skip.s);
-	if(nuri->len <= uri->len - skip.len) {
-		LM_ERR("uri buffer too small\n");
-		return -1;
-	}
-
-	p = nuri->s;
-	memcpy(p, uri->s, (size_t)(skip.s - uri->s));
-	p += skip.s - uri->s;
-	memcpy(p, skip.s + skip.len,
-			(size_t)(uri->s + uri->len - skip.s - skip.len));
-	p += uri->s + uri->len - skip.s - skip.len;
-	nuri->len = p - nuri->s;
-
-	LM_DBG("decoded <%.*s> => [%.*s]\n", uri->len, uri->s, nuri->len, nuri->s);
-	return 1;
-}
-
 /* address of record (aor) management */
 
 /* address of record considered case sensitive
diff --git a/src/core/dset.h b/src/core/dset.h
index 981f1a5d6a6..ccb0f669c95 100644
--- a/src/core/dset.h
+++ b/src/core/dset.h
@@ -284,7 +284,6 @@ int setbflagsval(unsigned int branch, flag_t val);
 
 int uri_add_rcv_alias(sip_msg_t *msg, str *uri, str *nuri);
 int uri_restore_rcv_alias(str *uri, str *nuri, str *suri);
-int uri_trim_rcv_alias(str *uri, str *nuri);
 
 int init_dst_set(void);
 
diff --git a/src/modules/nathelper/doc/nathelper_admin.xml b/src/modules/nathelper/doc/nathelper_admin.xml
index c73baf21a47..c188694d539 100644
--- a/src/modules/nathelper/doc/nathelper_admin.xml
+++ b/src/modules/nathelper/doc/nathelper_admin.xml
@@ -842,7 +842,7 @@ if(is_rfc1918("$rd")) {
 
 	<section id="nathelper.set_contact_alias">
 		<title>
-		<function moreinfo="none">set_contact_alias([trim])</function>
+		<function moreinfo="none">set_contact_alias()</function>
 		</title>
 		<para>
 		Adds an <quote>;alias=ip~port~transport</quote> parameter to the
@@ -850,16 +850,6 @@ if(is_rfc1918("$rd")) {
 		The new contact URI is immediately visible to other modules in the
 		way the <function>fix_nated_contact()</function> does it.
 		</para>
-		<para>Meaning of parameters:</para>
-		<itemizedlist>
-			<listitem>
-				<para>
-					<emphasis>trim</emphasis> - by default, set_contact_alias() will not detect and trim an
-					already existing alias parameter. If this optional parameter is set to "1", set_contact_alias()
-					will trim the existing alias before adding a new one.
-				</para>
-			</listitem>
-		</itemizedlist>
 		<para>
 		This function can be used from
 		REQUEST_ROUTE, ONREPLY_ROUTE, BRANCH_ROUTE, and FAILURE_ROUTE.
diff --git a/src/modules/nathelper/nathelper.c b/src/modules/nathelper/nathelper.c
index 2aa97bbe251..65db2a11c3c 100644
--- a/src/modules/nathelper/nathelper.c
+++ b/src/modules/nathelper/nathelper.c
@@ -110,7 +110,6 @@ static int fix_nated_contact_f(struct sip_msg *, char *, char *);
 static int add_contact_alias_0_f(struct sip_msg *, char *, char *);
 static int add_contact_alias_3_f(struct sip_msg *, char *, char *, char *);
 static int set_contact_alias_f(struct sip_msg *msg, char *str1, char *str2);
-static int w_set_contact_alias_f(struct sip_msg *msg, char *str1, char *str2);
 static int handle_ruri_alias_f(struct sip_msg *, char *, char *);
 static int pv_get_rr_count_f(struct sip_msg *, pv_param_t *, pv_value_t *);
 static int pv_get_rr_top_count_f(struct sip_msg *, pv_param_t *, pv_value_t *);
@@ -213,8 +212,6 @@ static cmd_export_t cmds[] = {
 	{"set_contact_alias",  (cmd_function)set_contact_alias_f,  0,
 		0, 0,
 		REQUEST_ROUTE|ONREPLY_ROUTE|BRANCH_ROUTE|LOCAL_ROUTE},
-	{"set_contact_alias",  (cmd_function)w_set_contact_alias_f, 1,
-		fixup_int_1, 0, REQUEST_ROUTE|ONREPLY_ROUTE|BRANCH_ROUTE|LOCAL_ROUTE},
 	{"handle_ruri_alias",  (cmd_function)handle_ruri_alias_f,    0,
 		0, 0,
 		REQUEST_ROUTE|BRANCH_ROUTE|LOCAL_ROUTE},
@@ -707,12 +704,10 @@ static int fix_nated_contact_f(struct sip_msg *msg, char *str1, char *str2)
  * Replaces ip:port pair in the Contact: field with the source address
  * of the packet.
  */
-static int set_contact_alias(struct sip_msg *msg, int trim)
+static int set_contact_alias(struct sip_msg *msg)
 {
 	char nbuf[MAX_URI_SIZE];
-	char sbuf[MAX_URI_SIZE];
 	str nuri;
-	str suri;
 	int br;
 
 	int offset, len;
@@ -723,24 +718,16 @@ static int set_contact_alias(struct sip_msg *msg, int trim)
 
 	nuri.s = nbuf;
 	nuri.len = MAX_URI_SIZE;
-	suri.s = sbuf;
-	suri.len = MAX_URI_SIZE;
 	if(get_contact_uri(msg, &uri, &c) == -1)
 		return -1;
 	if((c->uri.s < msg->buf) || (c->uri.s > (msg->buf + msg->len))) {
 		LM_ERR("you can't update contact twice, check your config!\n");
 		return -1;
 	}
-	if(trim > 0 && uri_trim_rcv_alias(&c->uri, &suri) > 0) {
-		if(uri_add_rcv_alias(msg, &suri, &nuri) < 0) {
-			LM_DBG("cannot add the alias parameter\n");
-			return -1;
-		}
-	} else {
-		if(uri_add_rcv_alias(msg, &c->uri, &nuri) < 0) {
-			LM_DBG("cannot add the alias parameter\n");
-			return -1;
-		}
+
+	if(uri_add_rcv_alias(msg, &c->uri, &nuri) < 0) {
+		LM_DBG("cannot add the alias parameter\n");
+		return -1;
 	}
 
 	br = 1;
@@ -782,19 +769,7 @@ static int set_contact_alias(struct sip_msg *msg, int trim)
 
 static int set_contact_alias_f(struct sip_msg *msg, char *str1, char *str2)
 {
-	return set_contact_alias(msg, 0);
-}
-
-static int w_set_contact_alias_f(struct sip_msg *msg, char *str1, char *str2)
-{
-	int i = 0;
-	if(str1) {
-		if(get_int_fparam(&i, msg, (fparam_t *)str1) < 0)
-			return -1;
-	}
-	if(i > 1)
-		i = 1;
-	return set_contact_alias(msg, i);
+	return set_contact_alias(msg);
 }
 
 #define SALIAS ";alias="