[OpenSIPS-Users] NAT traversal issue in case of different internal and external ports

[Alex Balashov]

Is the REGISTER request also coming from internal port 5065?

Krunal Patel wrote:

> Hi,
> 
> I am having an UAC behind NAT.
> When I send call to openser, openser does NAT traversal & detects 
> external IP & port.
> As per trace I found that  UAC sends request from some internal port and 
> router sends to openser with some other external port.
> external port is : 50034
> internal port is : 5065
> So openser sends 183 progress .. to 5065 instead of external port 50034.
> 
> Here is the sip trace:
> 
> U XXX.XXX.XXX.XXX:50034 -> YYY.YYY.YYY.YYY:5060
> INVITE sip:TO_NUM at domain SIP/2.0.
> Via: SIP/2.0/UDP [INTERNAL_IP]:5065;branch=
> z9hG4bK-a0646ab7.
> From: "FROM_NUM" <sip:FROM_NUM at domain>;tag=45a59ea2bc86747fo0.
> To: <sip:TO_NUM at domain>.
> ...
> 
> U YYY.YYY.YYY.YYY:5060 -> XXX.XXX.XXX.XXX:50034
> SIP/2.0 407 Proxy Authentication Required.
> Via: SIP/2.0/UDP 
> [INTERNAL_IP]:5065;branch=z9hG4bK-a0646ab7;rport=50034;received=XXX.XXX.XXX.XXX.
> From: "FROM_NUM" <sip:FROM_NUM at domain>;tag=45a59ea2bc86747fo0.
> To: <sip:TO_NUM at domain>;tag=b802e73ab92fec121a4f880263d541a3.b5ab.
> ...
> 
> U XXX.XXX.XXX.XXX:50034 -> YYY.YYY.YYY.YYY:5060
> ACK sip:TO_NUM at domain SIP/2.0.
> Via: SIP/2.0/UDP [INTERNAL_IP]:5065;branch=z9hG4bK-a0646ab7.
> From: "FROM_NUM" <sip:FROM_NUM at domain>;tag=45a59ea2bc86747fo0.
> To: <sip:TO_NUM at domain>;tag=b802e73ab92fec121a4f880263d541a3.b5ab.
> ...
> 
> U XXX.XXX.XXX.XXX:50034 -> YYY.YYY.YYY.YYY:5060
> INVITE sip:TO_NUM at domain SIP/2.0.
> Via: SIP/2.0/UDP [INTERNAL_IP]:5065;branch=z9hG4bK-a85eb9f3.
> From: "FROM_NUM" <sip:FROM_NUM at domain>;tag=45a59ea2bc86747fo0.
> To: <sip:TO_NUM at domain>.
> ...
> 
> U YYY.YYY.YYY.YYY:5060 -> ZZZ.ZZZ.ZZZ.ZZZ:5060
> INVITE sip:TO_NUM at ZZZ.ZZZ.ZZZ.ZZZ:5060;transport=udp SIP/2.0.
> Record-Route: 
> <sip:TO_NUM at domain:5060;nat=yes;ftag=45a59ea2bc86747fo0;lr=on>.
> Via: SIP/2.0/UDP YYY.YYY.YYY.YYY;branch=z9hG4bKf644.351975f.0.
> Via: SIP/2.0/UDP 
> [INTERNAL_IP]:5065;rport=50034;received=XXX.XXX.XXX.XXX;branch=z9hG4bK-a85eb9f3.
> From: "FROM_NUM" <sip:FROM_NUM at domain>;tag=45a59ea2bc86747fo0.
> To: <sip:TO_NUM at domain>.
> ...
> 
> U ZZZ.ZZZ.ZZZ.ZZZ:5060 -> YYY.YYY.YYY.YYY:5060
> SIP/2.0 100 Trying.
> Call-ID: df9cc79e-ffa2ffb3@[INTERNAL_IP].
> CSeq: 102 INVITE.
> From: "FROM_NUM" <sip:FROM_NUM at domain>;tag=45a59ea2bc86747fo0.
> To: <sip:TO_NUM at domain>;tag=3eddfbdb7400749.
> ...
> U ZZZ.ZZZ.ZZZ.ZZZ:5060 -> YYY.YYY.YYY.YYY:5060
> SIP/2.0 183 Session Progress.
> Call-ID: df9cc79e-ffa2ffb3@[INTERNAL_IP].
> CSeq: 102 INVITE.
> From: "FROM_NUM" <sip:FROM_NUM at domain>;tag=45a59ea2bc86747fo0.
> To: <sip:TO_NUM at domain>;tag=3eddfbdb7400749.
> ...
> 
> U YYY.YYY.YYY.YYY:5060 -> XXX.XXX.XXX.XXX:5065
> SIP/2.0 183 Session Progress.
> Call-ID: df9cc79e-ffa2ffb3@[INTERNAL_IP].
> CSeq: 102 INVITE.
> From: "FROM_NUM" <sip:FROM_NUM at domain>;tag=45a59ea2bc86747fo0.
> To: <sip:TO_NUM at domain>;tag=3eddfbdb7400749.
> ...
> 
> here is snippet from cfg:
> 
> route[3]
> {
>     # invite route
>         if(nat_uac_test("19") )
>         {
>                  setbflag(6); #Changed from 7 to 6 on 28-May-2008
>                  force_rport();
>                  fix_nated_contact();
>         }
>       # .......skipped other
> }
> 
> onreply_route[1] {
>               if (isbflagset(6) || isbflagset(7)) {
>               if (status =~ "(180)|(183)|2[0-9][0-9]")  {
>                         #xlog("----------- USE MEDIA PROXY ---------- \n ");
>                         use_media_proxy();
>                         force_rport();
>                 }
>         }
> 
>        if (nat_uac_test("19")) {
>                fix_nated_contact();
>         }
> }
> 
> Please let me know what I am doing wrong?
> 
> Thanks in Advance!!
> 
> --
> Krunal Patel
> 
> 
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> 
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-- 
Alex Balashov
Evariste Systems
Web    : http://www.evaristesys.com/
Tel    : (+1) (678) 954-0670
Direct : (+1) (678) 954-0671
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