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tutorials:alias-example [2011/04/22 20:27]
87.93.81.21 		tutorials:alias-example [2013/06/08 08:42] (current)
jh [In-Dialog Requests]
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 ===== Introduction ===== ===== Introduction =====
  
-The benefits of using add_contact_alias() and handle_ruri_alias() functions instead of conventional NAT traversal solutions are: +The benefit of using add_contact_alias() and handle_ruri_alias() functions instead of conventional NAT traversal solutions is that Request-URI in requests to UAs behind NATs is always what UAs expect. In the example below only functions related to signaling are shown.  Proxying of media using either Mediaprxy or RTP Proxy can be easily added.  In addition to handling NAT traversal, the example uses add_contact_alias() and handle_ruri_alias() functions for re-use of tcp/tls sessions between proxy and UAs.
- +
-  * Request-URI in requests to UAs behind NATs is always what UAs expect +
-  * Re-use of tcp sessions between proxy and UAs (optional) +
- +
-In the example below only functions related to signaling are shown.  Proxying of media using either Mediaprxy or RTP Proxy can be easily added. +
 ===== Non-Register Initial Requests ===== ===== Non-Register Initial Requests =====
  
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 ===== Register Requests ===== ===== Register Requests =====
  
-Call fix_nated_register() on register requests, if registering ua is +Call fix_nated_register() on register requests, if registering UA is 
-behind nat OR is using tcp.+behind NAT or transport protocol is not UDP.
  
 <code> <code>
 route [REGISTER_REQUESTS] { route [REGISTER_REQUESTS] {
     ...     ...
-    if (isflagset(FROM_NATED) || (proto == TCP) || (proto == TLS)) {+    if (isflagset(FROM_NATED) || (proto != UDP)) {
         fix_nated_register();         fix_nated_register();
         if (isflagset(FROM_NATED)) {         if (isflagset(FROM_NATED)) {
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 route [IN_DIALOG_REQUESTS] { route [IN_DIALOG_REQUESTS] {
  
-    if (REQUEST_COMES_FROM_BEHIND_NAT || ((@via[2] == "") && (proto != UDP))) {+    if (REQUEST_COMES_FROM_BEHIND_NAT || (is_first_hop() && (proto != UDP))) {
         route(ADD_CONTACT_ALIAS);         route(ADD_CONTACT_ALIAS);
     }     }

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