[SR-Users] NAT Problem! Not relay ACK, CANCEL and BYE to other UA

[Richard Brady]

Hi Tuan

Path doesn't do NAT traversal (although it plays a role) so it isn't a
replacement for fix_nated_contact and fix_nated_register. The best approach
is to replace them with add_contact alias and handle_ruri_alias.

Also be sure to set the advertised address on External A:

listen=192.168.1.10:5060 advertise 1.2.3.4:5060

you can find a tutorial
here<http://sip-router.org/wiki/tutorials/alias-example>and if you
search the list you should find my questions on the topic.

Richard

PS: You'll need to use version > 3.3.

On 9 January 2013 09:39, Nguyen Anh Tuan <tuanna3 at vnpt-technology.vn> wrote:

> Hi All,****
>
> ** **
>
> I have 2 interfaces - External A (behind NAT) and Internal B (LAN) in
> Kamailio Load Balance, and enable Multi-Homing function “mhomed=1”. ****
>
> Load Balance dispatches to Kamailio SIP Servers via the Internal B (LAN)
> (each Kamailio SIP server has both proxy and registrar in one box). For RTP
> relay, I use RTPproxy in other server, has 2 interfaces A&B like Load
> Balance. ****
>
> ** **
>
> If using 2 interfaces in Load Balance, Registration and calling NORMAL
> with 2 users behind NAT, but the call will be interrupted after 30 seconds
> due to the ACK message (after Ringing, 200 OK) STOP in Load Balance in
> return and not relayed to other UA . CANCEL and BYE have same error like
> ACK.****
>
> ** **
>
> I tried using only one interface for load balancing (External = Internal
> IP), and SIP Server binds to Load Balance in the same network, EVERYTHING
> IS OK.  ACK, CANCEL and BYE are not missing behind NAT.****
>
> ** **
>
> For NAT Traversal I use PATH Module in Load Balance, and add “Received”
> like this:****
>
> ...****
>
> modparam("path", "use_received", 1)****
>
> ..****
>
> ..****
>
> record_route();****
>
> add_path_received();****
>
> force_rport();****
>
> t_relay;****
>
> ..****
>
> ..****
>
> ** **
>
> And in SIP Server enable Path Parameter for Registrar:****
>
> modparam("registrar", "use_path", 1)****
>
> modparam("registrar", "path_mode", 1)****
>
> modparam("registrar", "path_use_received", 1)****
>
> ** **
>
> ****
>
> Enable “#!define WITH_NAT” in default kamailio.cfg for RTP Controlling,
> but I removed all fix_nated_register and fix_nated_contact in SIP Server,
> because using PATH module.I try enable both fix_nat_register and
> fix_nated_contact, or only fix_nat_register but NOT SOLVE Problem “missing
> ACK,CANCEL, and BYE in Load Balance” behind NAT.****
>
> ** **
>
> Best Regard, ****
>
> ** **
>
> Tuan.****
>
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>
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