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

[Krunal Patel]

Hi,

Ya, REGISTER request is coming from internal port 5065.

On Mon, Dec 15, 2008 at 6:31 PM, Alex Balashov <abalashov at evaristesys.com>wrote:

> 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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>>
>
>
> --
> Alex Balashov
> Evariste Systems
> Web    : http://www.evaristesys.com/
> Tel    : (+1) (678) 954-0670
> Direct : (+1) (678) 954-0671
> Mobile : (+1) (706) 338-8599
>
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