Re: Adding rport to outbound SIP INVITE

Hello,

see:

- https://www.kamailio.org/wikidocs/cookbooks/6.0.x/core/#add_local_rport
- https://www.kamailio.org/wikidocs/cookbooks/6.0.x/core/#local_rport

However, for receiving new SIP requests, the AWS gateway should do
1-to-1 port forwarding (not necessary 5060) that the remote UA has to be
aware of. In such case, the parameter listen with advertise has to be set.

Cheers,
Daniel

On 02.09.25 18:08, Martin Nyström via sr-users wrote:
>
> Hi,
>
>  
>
> Is it possible to add rport to the top Via for the outbound INVITE?
> The Kamailio be behind an AWS NAT Gateway and we’re having the issue
> with the provider not replying to the source port but instead 5060.
> From what I have understood if we add the rport; without value in the
> Via it will tell the receiver to reply to the source ip and port.
>
>  
>
> Here’s the route block for calls sent to the PSTN.
>
> route[PSTN] {
>
>  
>
>                 ds_select_dst(1, 4);
>
>  
>
>                 force_rport();
>
>  
>
>                 record_route();
>
>  
>
>                 t_on_failure("FAILURE_PROVIDER");
>
>  
>
>                 route(RELAY);
>
>                 exit;
>
>  
>
> }
>
>  
>
>  
>
> The outbound invite towards PSTN looks like this, missing rport in the
> top Via
>
>  
>
> INVITE sip:[email protected] SIP/2.0
>
> Record-Route:
> <sip:10.3.130.39:5060;lr;ftag=b9827f5a-fef3-42f6-b8a4-aded67374bfb;lr;vsf=AAAAAAAAAAAAAAAAAAAAAAABFhMACBBKBhFDQhMBQhgBSggVQQ8SQAEWBk8ACm5uZWN0ZWwuYXBw>
>
> Via: SIP/2.0/UDP
> sbc.coolcompany.com:5060;branch=z9hG4bK350f.eb699686bbd2c208bd77d3d92fd5ed55.0
>
> Via: SIP/2.0/UDP
> 10.2.8.34:5060;received=10.2.8.34;rport=5060;branch=z9hG4bKPj405acf54-c51d-4681-a7c7-9774ee63e219
>
> From:
> <sip:[email protected]:5060>;tag=b9827f5a-fef3-42f6-b8a4-aded67374bfb
>
> To: <sip:+4670xxxxxx@xxxxxxxx>
>
> Contact: xxxx
>
> Call-ID: bba640af-369e-4a6c-b5ec-3974919d98c9
>
> CSeq: 5899 INVITE
>
> Allow: OPTIONS, REGISTER, SUBSCRIBE, NOTIFY, PUBLISH, INVITE, ACK,
> BYE, CANCEL, UPDATE, PRACK, INFO, MESSAGE, REFER
>
> Supported: 100rel, timer, replaces, norefersub, histinfo
>
> Session-Expires: 1800
>
> Min-SE: 90
>
> Max-Forwards: 69
>
> User-Agent: Voice SBC
>
> Content-Type: application/sdp
>
> Content-Length:   310
>
>  
>
>  
>
>  
>
> /M
>
>
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-- 
Daniel-Constantin Mierla (@ asipto.com)
twitter.com/miconda -- linkedin.com/in/miconda
Kamailio Consultancy, Training and Development Services -- asipto.com

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