[SR-Users] Understanding port changing

[Pan Christensen]

Hello!

This is probably caused by SIP ALG in the NAT router. Compare what the client sends to what you receive on the server.

With kind regards
Pan B. Christensen
Developer
Phonect AS

> -----Original Message-----
> From: sr-users <sr-users-bounces at lists.kamailio.org> On Behalf Of Social
> Boh
> Sent: onsdag 9. mai 2018 18:32
> To: sr-users at lists.kamailio.org
> Subject: [SR-Users] Understanding port changing
> 
> Hello list,
> 
> I'm looking for to understand a problem have with Kamailio.
> 
> The configuration is:
> 
> user (behind NAT) -> Kamilio (Public IP) -> user (behind NAT)
> 
> When I make a call from user A to user B (both registered) , User B receive
> the INVITE correctly but in the ringing SIP message change the port present
> on the Contact Header and same think on 200OK so when Kamailio try to
> send it ACK SIP message to this port fail because the Softphone listen on the
> port where has received the INVITE from Kamailio.
> 
> This happens with 3 different Softphone: BRIA, Xlite, Linphone on the same
> computer.
> 
> Thank you
> 
> Regards
> 
> --
> ---
> I'm SoCIaL, MayBe
> 
> 
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