[Kamailio-Users] two UACs behind same NAT

Dubravko Caric dubravko_caric at yahoo.com
Mon May 4 16:59:55 CEST 2009


Hi,

________________________________
From: Iñaki Baz Castillo <ibc at aliax.net>
Cc: users at lists.kamailio.org
Sent: Monday, May 4, 2009 3:32:59 PM
Subject: Re: [Kamailio-Users] two UACs behind same NAT

2009/5/4 dubravko caric <dubravko_caric at yahoo.com>:

>> Strange thing is that UAC#1 sends Ringing response and OK message with this
>> information in Contact header:
>> Contact: <sip:bob at public_ip_address:31479;rinstance=e0f8548cf68b5b6e>

>Questions:
>- Does this router use the painful SIP ALG?
>     http://www.voip-info.org/wiki/view/Routers+SIP+ALG

didn't find anything regarding SIP and ALG in the device specification but I did find this http://www.easyofficephone.com/support/router-compatibility#linksys_wrt54g:

"This router is not recommended for use with voice over ip services
using the stock firmware from Linksys. This model router is known to
damage and modify SIP packets in such a way that it prevents voice over
ip packets from being formatted correctly and can cause a multitude of
problems."

i'll check everything once more...


>> but proxy forwards this Ringing response and OK message to UAC#2 with this
>> information in Contact header:
>> Contact: <sip:bob at public_ip_address:0;rinstance=b18efeaa8a0e3f0f>

>How is possible that the proxy replaces 31479 with 0 ???
>You must be doing something wrong with the Contact header.

i'm
not doing any manipulation with Contact header, all other scenarios are
working fine as long as I don't use two clients behind this specific
router.


Thank you very much for your reply


Dubravko


--
Iñaki Baz Castillo
<ibc at aliax.net>

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