[Serusers] interesting 2 way SIP signalling problem

[Ladislav Andel]

Hi,
Looks like you are mixing together nathelper and mediaproxy module.
You need to call force_rport() even for INVITEs.
Look at Getting started ser configs
ftp://siprouter.onsip.org/pub/gettingstarted/configs/

Lada

İlker Aktuna (Koç.net) wrote:
> Hi,
>
> Did you receive my reply yesterday ?
>
> Thanks,
> ilker
>
> -----Original Message-----
> From: serusers-bounces at lists.iptel.org [mailto:serusers-bounces at lists.iptel.org] On Behalf Of İlker Aktuna (Koç.net)
> Sent: Monday, April 09, 2007 11:29 AM
> To: Ladislav Andel
> Cc: serusers at iptel.org
> Subject: RE: [Serusers] interesting 2 way SIP signalling problem
>
> Hi,
>
> This is under my method=="REGISTER" section:
>
>         if (nat_uac_test("1")) {
>                 setflag(6);
>                 fix_nated_contact();
>                 force_rport();
>         };
>
>
> I also have this under method=="INVITE" :
>
> if (method=="INVITE" || method=="ACK") {
>
>                         if (client_nat_test("19")) {
>                                 fix_nated_contact();
>                         };
>
> And this one under a onreply route :
>
> onreply_route[2] {
>       if (status=~"(183)|(2[0-9][0-9])") {
>         use_media_proxy();
>
>         if (nat_uac_test("19")) {
>                 fix_nated_contact();
>         };
>       }
>     };
>
>
> Thanks for your reply...
>
> ilker 
>
> -----Original Message-----
> From: Ladislav Andel [mailto:ladaan at iptel.org]
> Sent: Monday, April 09, 2007 11:31 AM
> To: İlker Aktuna (Koç.net)
> Cc: serusers at iptel.org
> Subject: Re: [Serusers] interesting 2 way SIP signalling problem
>
> Hi,
>
> do you call  force_rport() function for NATed clients?
> Can you paste in the NAT section of your ser.cfg here?
> Paste in NAT detecting section too.
>
> Lada
>
>
> İlker Aktuna (Koç.net) wrote:
>   
>> Hi,
>>
>> I have a working configuration on my SER server. Most of the users can make calls (both way incoming and outgoing) with no problem.
>> However, I have some clients that can't make calls. 
>> When I analyze these by ngrep and/or tcpdump, I see that the SER server does not reply the packet on the correct port.
>>
>> For example, I have a testing client which is behind NAT.
>> The client sends INVITE message from UDP port 3023 to port 5061 of my SER.
>> (cseq number is 1)
>> SER exchanges the message with the uplink sip gateway and when it 
>> receives a "OK" response it forwards this message to the client's NAT 
>> IP address BUT on a different port (14640) with correct cseq number
>> (1)
>>
>> Of course, this new port is not open on the NAT router and it does not reach the client.
>>
>> I see that the first INVITE message has Contact field with internal IP address of the client and the port number as 14640.
>> So the SER server sends the returning message to the external IP address with internal port number.
>>
>> How can I fix this issue ?
>>
>> I can send the configuration of my SER server if that would help to find the problem.
>>     
>
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