[SR-Users] rport parameter in VIA header in uac remote registration

[Daniel-Constantin Mierla]

Hello,

try to catch uac registrations requests inside
event_route[tm:local-requests] and use add_local_rport() for them -- not
sure it works because I haven't tracked in the code, given that
add_local_rport() was intended for forwarding incoming requests, but it
is a chance it does.

Cheers,
Daniel

On 11.11.20 08:38, Jetse Verschuren wrote:
> Hi,
>
> I'm currently trying to connect Kamailio, running in docker, to my
> FritzBox. The FritzBox is the modem provided by my ISP, with a builtin
> voip server which I can use to dial out (basically a PSTN gateway). In
> my setup I have a custom router/firewall/NAT between the FritzBox and
> the server.
> When I connect LinPhone to the FritzBox, from behind the NAT, it works
> fine. But when I use the Kamailio uac remote registration,  I don't
> get a response. After some investigation with wireshark, I found that
> the the SIP response from the FritzBox comes on the wrong port, and
> gets rejected by the NAT. The request comes from port 1025, but the
> response is sent to port 5060. I compared the requests from LinPhone
> and Kamailio, and combined with some research, found it probably was
> the rport option in the VIA header. From what I read, it basically
> signals the uas to use the source port to reply to, instead of the
> port indicated in the request, which would be necessary to effectively
> go through a NAT.
> After reading a lot of documentation (and even parts of the source), I
> wasn't able to find an option to enable this option. Is there some
> option I completely missed, or is it not possible? Or am I completely
> wrong in my "diagnosis"?
>
>
> Thanks in advance,
> Jetse
>
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-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Funding: https://www.paypal.me/dcmierla

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