[OpenSIPS-Users] Trouble with nat handling.

[Гогичашвили Андрей]

Hello. Yes, we use it in “Invite method”.

 

 

From: voipfreak.net at gmail.com [mailto:voipfreak.net at gmail.com] On Behalf Of Laszlo
Sent: Thursday, April 04, 2013 9:07 PM
To: a.gogichashvili at ptl.ru
Subject: Re: [OpenSIPS-Users] Trouble with nat handling.

 

Hi Andrei,

Do you use force_rport(); in the config?

 

2013/4/4 Гогичашвили Андрей <a.gogichashvili at ptl.ru>

Hello! I have some trouble with nat handling.

I have such scheme:

uac1---opensips---(NAT)---uac2

I call to UAC2 and signaling establishment is ok. When  UAC2 sends BYE  opensips translates 200OK (received from UAC1) to the wrong port. 

 

BYE generated by UAC2 has such via header:

“Via: SIP/2.0/UDP 192.168.18.137:5060;branch=z9hG4bK8b517b11a415”

and the BYE comes from U 2013/04/04 17:21:50.287792 1.1.1.1:59292 -> 2.2.2.2:5068

Where 1.1.1.1 – nat, 2.2.2.2 - opensips

 

Opensips adds one more via header to the BYE:

Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bK7f45.debc1592.0. 

and changes first via header by adding received field:

Via: SIP/2.0/UDP 192.168.18.137:5060;received=1.1.1.1;branch=z9hG4bK8b517b11a415

 

200 OK got from UAC1 opensips tries to send not to 1.1.1.1:59292 but to 1.1.1.1:5060

The question is how can we make opensips to send 200 OK to 59292 port?

 

Thank you for any help.

 

 


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