Hi Hoa,

Thanks for the answer, but that's what I do(10 seconds for nat ping interval) :( What's strange is the fact that these users wich can't be joined (10% of our users), can call any destination without problem, no problem of media. It means that the nat detections works correctly. One of them can be joined until he receives one unanswered call, after that, he have to reset his ata :(

Olivier

-----Message d'origine----- De : Hoa Thai Duy [mailto:hoathai@vngt.vn] Envoyé : mercredi 25 janvier 2006 4:54 À : 'Olivier Taylor'; 'seruser' Objet : RE: [Serusers] rtpproxy

Hello Olivier

See http://www.iptel.org/ser/doc/modules/html/nathelper.html#AEN59

Try using Nat Ping in nethelper module. By default, it is disabled. If we don't ping NATed UAs from SER, NAT device (ADSL modem, Cable modem, other CPE) will block all SIP messages when the NAT entry for port 5060 expired.

Most of the UAs use registration period (refresh frequency) too long, eg. 1 hour. That also the cause for not to refresh the NAT entry.

Hope it help

Brgds

Hoa Thai Duy

-----Original Message----- From: serusers-bounces@iptel.org [mailto:serusers-bounces@lists.iptel.org] On Behalf Of Olivier Taylor Sent: Tuesday, January 24, 2006 2:39 PM To: 'seruser' Subject: [Serusers] rtpproxy

Hi all,

I have a ser(0.9.4/Freebsd) server well working, but in some cases, I have a strang behavior. I use rtpproxy for nat traversal,all my users can call pstn, but when we try to call one of our users from internal or from pstn, Ser sends many invites and callee never answer to these invite. I must conclude that they don't receive it... All the users having that problems are under a nated network.

Any idea ?

Olivier

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