add_rport_local_via

diff --git a/modules/tm/t_msgbuilder.c b/modules/tm/t_msgbuilder.c
index 3ab29d7..cee5a9e 100644
--- a/modules/tm/t_msgbuilder.c
+++ b/modules/tm/t_msgbuilder.c
@@ -603,6 +603,7 @@ static inline int assemble_via(str* dest, struct cell* t, struct socket_info* so
        int len;
        unsigned int via_len;
        str branch_str;
+       str rport_str = str_init(";rport");
        struct hostport hp;
 
        if (!t_calc_branch(t, branch, branch_buf, &len)) {
@@ -613,12 +614,8 @@ static inline int assemble_via(str* dest, struct cell* t, struct socket_info* so
        branch_str.s = branch_buf;
        branch_str.len = len;
 
-#ifdef XL_DEBUG
-       printf("!!!proto: %d\n", sock->proto);
-#endif
-
        set_hostport(&hp, 0);
-       via = via_builder(&via_len, sock, &branch_str, 0, sock->proto, &hp);
+       via = via_builder(&via_len, sock, &branch_str, &rport_str, sock->proto, &hp);
        if (!via) {
                LM_ERR("via building failed\n");
                return -2;