I can see the temptation, but that’s actually looking at it backwards.

If you have multiple listeners, e.g.

listen=udp:x.x.x.x:5060
listen=udp:y.y.y.y:5060

or multiple listeners on the same interface with multiple ports, if it’s NAT’d 
AWS-style, e.g.

listen=udp:x.x.x.x:5060
listen=udp:x.x.x.x:5080 advertise “y.y.y.y:5080”

you can steer the traffic by manipulating the $fs pseudovar:

https://www.kamailio.org/wiki/cookbooks/5.2.x/pseudovariables#fs_-_forced_socket

or, in the case of bridging between two disparate networks as formerly, just 
make use of automated outgoing interface discovery behaviour:

https://www.kamailio.org/wiki/cookbooks/5.2.x/core#mhomed

Assuming you have the ‘enable_double_rr’ parameter enabled, which you should:

https://kamailio.org/docs/modules/5.2.x/modules/rr.html#rr.p.enable_double_rr

you will find that the Record-Route headers automatically contain the correct 
ingress and egress listener addresses in the right directions at the right 
times, and you don’t need to do any byzantine management of their content. :-)

—
Sent from mobile, with due apologies for brevity and errors.

> On Aug 27, 2019, at 9:43 AM, Sergiu Pojoga <[email protected]> wrote:
> 
> Do you have: mhomed=1 ?
> 
>> On Tue, Aug 27, 2019 at 8:52 AM przeqpiciel <[email protected]> wrote:
>> Thank you for the reply. It little help for me, Right now probably I have to 
>> make logic which change record route depends on it where Kamailio send 
>> packets internal / outside
>> 
>> pon., 26 sie 2019 o 22:21 Alex Balashov <[email protected]> 
>> napisał(a):
>>> Hi,
>>> 
>>> You may wish to have a look at the ‘advertise’ directive to the core 
>>> listen= parameter:
>>> 
>>> https://www.kamailio.org/wiki/cookbooks/5.2.x/core#listen
>>> 
>>> For more fine-grained control, record_route_preset() takes an argument:
>>> 
>>> https://kamailio.org/docs/modules/5.2.x/modules/rr.html#rr.f.record_route_preset
>>> 
>>> But the first approach is better and more comprehensive for your situation, 
>>> since it also covers Via.
>>> 
>>> — Alex
>>> 
>>> —
>>> Sent from mobile, with due apologies for brevity and errors.
>>> 
>>>> On Aug 26, 2019, at 4:12 PM, przeqpiciel <[email protected]> wrote:
>>>> 
>>>> Hi,
>>>> I have some issue and dont have enought knowledge to fix it. I have simple 
>>>> infrastructure.
>>>> Internet -> router (NAT) -> kamailio
>>>>                                        -> asterisk
>>>> Kamailio and Asterisk are inside the network and Kamailio places his own 
>>>> private address in the "record-route" headers instead of who's public. 
>>>> There is configuration to said to him what IP is proper ?
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